1-9 A-D E-G H-M N-P Q-S T-Z


Phosphoric acid= Orthophosphoric acid

CAS no.: 7664-38-2
EC / List no.: 231-633-2
Mol. formula: H3O4P

Phosphoric acid is an important industrial chemical used as an intermediate in the fertilizer industry, for metal surface treatment in the metallurgical industry and as an additive in the food industry.

Acide phosphorique
Acido fosforico
Acidum phosphoricum
Hydrogen phosphate
o-Phosphoric acid
Orthophosphoric acid

Phosphoricum acidum

White phosphoric acid

CAS names
Phosphoric acid

Phosphorsäure ... %
Reaction mass of 1-methoxypropan-2-ol and oxalic acid and sulphuric acid and (2-methoxymethylethoxy)propanol
Reaction mass of 64-19-7 and 7697-37-2
Reaction mass of ortho-phosphoric aceide, zinc oxide and aluminium oxide
trihydroxido oxidophosphorus
Trihydroxidooxidophosphorus Phosphoric acid 
Trihydroxidooxidophosphorus phosphoric acid
trihydroxidooxidophosphorus phosphoric acid

Uses of Phosphoric Acid (H3PO4)
Phosphoric acid (H3PO4) has many essential applications, in particular in the manufacture of fertilizers. 
Many acids are derived from phosphate rocks by a wet process based on the reaction between phosphate rocks and acid solutions.

It is used as fertilizers – around 90% of phosphoric acid produced is used as fertilizers
It is used in as a supplement feed for pigs, cattle, poultry
It is used in skincare products, cosmetics as a pH adjuster
It is used in brewing, food and dairy industries as a sanitizing agent
It is used in beverages and food like jam and cola to acidify them
It is used to remove rust from the surface to metals
Health Hazard
Phosphoric acid is less corrosive and hazardous than is concentrated sulphuric or nitric acid. Its concentrated solutions are irritants to the skin and mucous membranes. The vapours contain P2O5 fumes can cause irritation to the throat and coughing but could be tolerated at <10mg/m3.

Phosphoric acid is a noncombustible substance in both solid and liquid forms. 
It may be fatal if inhaled. Fumes from fires are irritating to respiratory passages, eyes, skin, and may contain phosphine, phosphoric acid, hydrogen chloride.

Phosphoric Acid is a colorless, odorless phosphorus-containing inorganic acid. 
Phosphoric acid is a sequestering agent which binds many divalent cations, including Fe++, Cu++, Ca++, and Mg++. 
Phosphoric acid is used in dentistry and orthodontics as an etching solution, to clean and roughen the surfaces of teeth where dental appliances or fillings will be placed. 
In addition, phosphoric acid is a constituent in bone and teeth, and plays a role in many metabolic processes.

Phosphoric acid is a phosphorus oxoacid that consists of one oxo and three hydroxy groups joined covalently to a central phosphorus atom. 

Phosphoric acid has a role as a solvent, a human metabolite, an algal metabolite and a fertilizer. 
Phosphoric acid is a conjugate acid of a dihydrogenphosphate and a phosphate ion.

Phosphoric acid (orthophosphoric acid, monophosphoric acid or phosphoric(V) acid), is a weak acid with the chemical formula H3PO4. 
The pure compound is a colorless solid.

All three hydrogens are acidic to varying degrees and can be lost from the molecule as H+ ions (protons). 
When all three H+ ions are removed, the result is an orthophosphate ion PO43−, commonly called "phosphate". 
Removal of one or two protons gives dihydrogen phosphate ion H2PO−4, and the hydrogen phosphate ion HPO2−4, respectively. 
Orthophosphoric acid also forms esters, called organophosphates.

Phosphoric acid is commonly encountered in chemical laboratories as an 85% aqueous solution, which is a colourless, odourless, and non-volatile syrupy liquid. 
Although phosphoric acid does not meet the strict definition of a strong acid, the 85% solution can still severely irritate the skin and damage the eyes.

The name "orthophosphoric acid" can be used to distinguish this specific acid from other "phosphoric acids", such as pyrophosphoric acid. 
Nevertheless, the term "phosphoric acid" often means this specific compound; and that is the current IUPAC nomenclature.

Phosphoric acid, also called orthophosphoric acid, (H3PO4), the most important oxygen acid of phosphorus, used to make phosphate salts for fertilizers. 
Phosphoric acid is also used in dental cements, in the preparation of albumin derivatives, and in the sugar and textile industries. It serves as an acidic, fruitlike flavouring in food products.

Pure phosphoric acid is a crystalline solid (melting point 42.35° C, or 108.2° F); in less concentrated form it is a colourless syrupy liquid. 
The crude acid is prepared from phosphate rock, while acid of higher purity is made from white phosphorus.

Phosphoric acid (H3PO4) is the leading inorganic acid produced and consumed in terms of production value and it is the second largest in terms of volume—after sulfuric acid. 
By far its greatest use is in the manufacture of phosphate chemicals consumed primarily as carriers of phosphorus values in fertilizers. 
Use in the production of animal feeds is of secondary importance. 

Phosphoric acid is also used in the manufacture of phosphate chemicals for use in water treatment and detergent builders, dentifrices, fire control chemicals, and a host of smaller markets. 
Consumption of phosphoric acid for its acid properties is relatively small (e.g., treatment of metal surfaces, beverage acidulation). 

Phosphoric acid is the leading intermediate product or processing step between phosphate rock and the end markets for phosphorus in phosphate form.

Phosphoric acid forms three classes of salts corresponding to replacement of one, two, or three hydrogen atoms. Among the important phosphate salts are: sodium dihydrogen phosphate (NaH2PO4), used for control of hydrogen ion concentration (acidity) of solutions; disodium hydrogen phosphate (Na2HPO4), used in water treatment as a precipitant for highly charged metal cations; trisodium phosphate (Na3PO4), used in soaps and detergents; calcium dihydrogen phosphate or calcium superphosphate (Ca[H2PO4]2), a major fertilizer ingredient; calcium monohydrogen phosphate (CaHPO4), used as a conditioning agent for salts and sugars.

Phosphoric acid molecules interact under suitable conditions, often at high temperatures, to form larger molecules (usually with loss of water). Thus, diphosphoric, or pyrophosphoric, acid (H4P2O7) is formed from two molecules of phosphoric acid, less one molecule of water. It is the simplest of a homologous series of long chain molecules called polyphosphoric acids, with the general formula H(HPO3)nOH, in which n = 2, 3, 4, . . . . Metaphosphoric acids, (HPO3)n, in which n = 3, 4, 5, . . ., are another class of polymeric phosphoric acids. The known metaphosphoric acids are characterized by cyclic molecular structures. The term metaphosphoric acid is used also to refer to a viscous, sticky substance that is a mixture of both long chain and ring forms of (HPO3)n. The various polymeric forms of phosphoric acid are also prepared by hydration of phosphorus oxides.

Chemical Properties of Phosphoric Acid (H3PO4)
Phosphoric acid is a deliquescent solid, generally encountered as a viscous aqueous solution.
It is weakly acidic, with three possible sequential deprotonation steps, forming phosphates.
Like carboxylic acids, phosphoric acid can dimerize via a dehydration reaction to form phospho anhydrides.
Phosphoric acid is referred to as being tribasic, in that it has three possible dissociation steps.
As a result mono and disodium and potassium salts of phosphoric acid are routinely used as pH buffers.
One of the most important reactions of phosphoric acid and its derivatives is multimerization.
As with carboxylic acids, two phosphoric acid molecules may combine with the loss of water to form a di phosphate ester also referred to as pyrophosphate.
However, as phosphoric acid has further -OH functionalities triphosphates may also be formed.
Salts of phosphoric acid are solid and many are relatively water-insoluble unless a strong mineral acid is present.

Phosphoric Acid
Phosphoric acid (H3PO4) has three ionizable protons (triprotic acid) that are released in successive reactions.

Ataman’s phosphoric acid is suitable for use in a range of applications including industrial water treatment, metal treatment for phosphating, cleaning of equipment, pH modification, aqueous based paints, varnishes and wash primer systems, rust conversion and fertilisers for horticulture.

Phosphoric acid, also known as orthophosphoric acid, is a triprotic acid that exists as a dense liquid. 
Phosphoric acid is an irritant or corrosive to the skin, eyes, and other mucous membranes of both humans and laboratory animals. 
Phosphoric acid's salts, though, exhibit a significantly lower irritancy potential. Moderate toxicity has been observed in mice when exposed via the inhalation route. 
Phosphoric acid is not genotoxic nor carcinogenic, but phosphate salts have been reported to promote the activity of known carcinogens. 
Exposures to Phosphoric acid are treated typically by irrigation or flushing with water. 
Phosphoric acid has enjoyed significant interest as a food additive to various cola drinks, causing great controversy with regard to the potential for harmful effects. 
The major consideration in the pollution of the aquatic environment is the pH of the water as regards effects on indigenous flora and fauna. 
There is no bioamplification or bioaccumulation reported.

Phosphoric acid is used predominantly as an acidulant, almost exclusively in the production of carbonated beverages, although its use in foods bears controversy due to its effects on health. 
Comparatively, phosphoric acid is extremely inexpensive, possessing a characteristic flat sour taste that is reminiscent of citric acid. 

Phosphoric acid is a relatively strong, dissociated acid, enabling it to easily acidify colas to the low desired pH (2.5) needed to establish proper carbonation, although its antimicrobial efficacy is far inferior to most organic acids, principally due to its dissociated state, which precludes ease of transport across the bacterial membrane.

Phosphoric acid is a component of fertilizers (80% of total use), detergents, and many household cleaning products. 
Dilute solutions of Phosphoric acid have a pleasing acid taste; thus, it's also used as a food additive, lending acidic properties to soft drinks and other prepared foods, and in water treatment products. 
Phosphoric acid is also used in rust proofing, engraving, and metal coating and is an intermediate or reagent in many manufacturing processes. 
Phosphoric acid also occurs naturally in many fruits and their juices. 
Apart from use of phosphoric acid itself, the greatest consumption of phosphoric acid is in the manufacture of phosphate salts. 
Taking advantage of its ability to lower blood pH, phosphoric acid has been used therapeutically to treat lead poisoning.

Phosphoric acid is produced by the reaction of fluorapatite known as 'phosphate rock' 3Ca3 (PO4) 2.CaF2 with sulfuric acid. 
Phosphoric acid is a chemical that appeals to different sectors and has many uses. 
Phosphoric acid is the main raw material input of phosphate fertilizer production. 
Phosphoric acid is mostly used in the production of phosphate fertilizers, the pharmaceutical industry, agriculture, metal cleaning, polishing and food for acidity regulation.

Phosphoric acid is the basic raw material used in the manufacture of phosphates (or phosphate salts).
Phosphoric acid is a mineral acid and is made by treating phosphate ore or phosphorus combustion. 

Phosphoric acid's distinctive properties include:

stability in the presence of most organic compounds
low volatility
pleasant, bitter flavour when used in low concentrations
dispersion in alcohol and hot water.

Phosphoric Acid is used in a wide array of applications including the manufacturing of phosphate salts.

In addition to being a chemical reagent, Phosphoric Acid Food Grade is used as an ingredient in foods and beverages. 
Phosphoric Acid is typically used for pH control in the food industry, for example in the manufacture of cheese products, fats, and shortenings.  
It is also used in the beverage industry in soft drinks, particularly cola. 

Phosphoric Acid Tech Grade is used in plant nutrition applications to provide precise and targeted fortification with water-soluble solutions.  

Phosphoric Acid is also used for water treatment, metal finishing, construction, and other industrial applications.

Phosphoric acid was discovered independently as a component of bone ash in 1770 by two Swedish chemists, Johann Gottlieb Gahn (1745–1818) and Karl Wilhelm Scheele (1742–1786). 
Four years later, Scheele discovered that the acid could be made by adding nitric acid to phosphorus.

Phosphoric acid is commercially available in a number of technical grades, ranging from agricultural (relatively low purity) to technical (from 50 to 100 percent purity) to FCC (Food Chemicals Codes) quality of at least 75 percent phosphoric acid.
The remaining 5 percent of phosphoric acid produced is used in a very wide range of commercial, industrial, and household products, including:

For pickling cleaning and treating metallic surfaces, especially in the steel industry;
In the synthesis of inorganic chemical compounds;
As a catalyst in the manufacture of ethanol (ethyl alcohol), ethylene, and other organic compounds;
As a food additive in a number of products, such as colas, beers, jams, and cheeses, where it adds a touch of tartness to the product;
In the dentistry profession, where it is used to etch and clean teeth;
In a number of consumer products, such as soaps, detergents, and toothpastes;
As a refining and clarifying agent in the production of sugar;
In the dyeing of cotton;
As a binder for cement;
In the manufacture of waxes and polishes; and
In water and sewage treatment plants.

Phosphoric Acid and Polyphosphoric Acid are used in many chemical manufacturing processes.


Phosphoric Acid is supplied as a raw material for customer wishing to make downstream phosphate based products.

Phosphoric Acid is used to make: 

Phosphoric Acid Line Cleaners
Transition Metal Phosphate Salts like Manganese Phosphate or Zinc Phosphate
Metal phosphatizing Solutions
Aluminum bright dip Solutions

Manufacture of phosphoric acid
Phosphoric acid is made by two processes:

a) the 'wet' process

b) thermal process

The thermal method normally produces a more concentrated and purer product, but is energy intensive (because of the manufacture of phosphorus itself. Acid produced by the 'wet' route is less pure but is used in the manufacture of fertilizers.

(a) Wet process
Phosphoric acid is produced from fluorapatite, known as phosphate rock, 3Ca3(PO4)2.CaF2, by the addition of concentrated (93%) sulfuric acid in a series of well-stirred reactors. This results in phosphoric acid and calcium sulfate (gypsum) plus other insoluble impurities.  Water is added and the gypsum is removed by filtration along with other insoluble materials (e.g. silica).  Fluoride, as H2SiF6, is removed at a further stage by evaporation.

Although the reaction takes place in stages involving calcium dihydrogenphosphate, the overall reaction can be represented as:

However, there are side reactions; for example with calcium fluoride and calcium carbonate present in the rock:

Fluorosilicilic acid is an important by-product from this and from the manufacture of hydrogen fluoride.  It can be neutralised with sodium hydroxide to form sodium hexafluorosilicate. The acid is also used to make aluminium fluoride, used in turn in the manufacture of aluminium.

The crystal structure of the calcium sulfate formed depends on the conditions of the reaction.  At 340-350 K, the principal product is dihydrate, CaSO4.2H2O. At 360-380 K, the hemihydrate is produced, CaSO4.1/2H2O.

Calcium sulfate is filtered off and the acid is then concentrated to ca 56% P2O5 using vacuum distillation.

The product from the 'wet process' acid is impure but can be used, without further purification, for fertilizer manufacture (see below).  Alternatively it can be evaporated further to ca 70% P2O5, a solution called superphosphoric acid which is used directly as a liquid fertrilizer.

To make industrial phosphates, the acid is purified by solvent extraction using, for example, methyl isobutyl ketone (MIBK) in which the acid is slightly soluble and concentrated to give 60% P2O5 content.  This acid can be further purified using solvents to extract it from heavy metals and defluorinated (by evaporation) to produce a product of food grade quality.

(b) Thermal process
The raw materials for this process are phosphorus and air:

Initially, phosphorus is sprayed into the furnace and is burnt in air at about 1800-3000 K.

Most processes use undried air and many involve the addition of steam to the phosphorus burner to produce and maintain a film of condensed polyphosphoric acids which protect the stainless steel burner tower (externally water cooled).  
The products from the burner tower pass directly into a hydration tower where the gaseous phosphorus oxide is absorbed in recycled phosphoric acid:

Alternatively, the phosphorus may be burnt in dried air. The phosphorus pentoxide is condensed as a white powder and separately hydrated to phosphoric acid.

This method allows heat to be recovered and reused.

Burning and direct hydration, as previously described, creates highly corrosive conditions.  
The equipment is constructed from stainless steel or is carbon brick-lined.  
To reduce corrosion, the walls of the burner and hydrator towers are cooled, but the reactor products emerge at a temperature too low for useful heat recovery.

The product acid has a concentration of ca 85%.
Tetraphosphoric acid, one of a family of polyphosphoric acids which can be selectively produced, is made either by boiling off water at high temperatures in a carbon vessel, or by adding solid phosphorus pentoxide to almost boiling phosphoric acid.  
The first method usually gives the purer product, due to the high arsenic content of phosphorus pentoxide.

The salts of phosphoric acid, the phosphates, are the compounds that are widely used in agriculture, industry and in the home.

(a) Ammonium phosphates
Monoammonium dihydrogenphosphate and diammonium hydrogenphosphate are much used as fertilizers and are made by mixing the correct proportions of phosphoric acid with anhydrous ammonia in a rotating drum.

The choice of which ammonium phosphate to use depends on the proportion of nitrogen and phosphorus needed for the crop.

(b) Calcium phosphates
The calcium phosphates are used extensively as fertilizers. Calcium dihydrogenphosphate, Ca(H2PO4)2, is produced by the reaction of phosphate rock with sulfuric acid:

This is known as superphosphate. It contains ca 20% P2O5.
If phosphate rock is treated with phosphoric acid, rather than sulfuric acid, a more concentrated form of calcium dihydrogenphosphate is produced with an overall higher P2O5 level (50%):

This is known as triple superphosphate.  
The higher level of phosphate is achieved because the product is no longer diluted with calcium sulfate.

(c) Sodium phosphates
Sodium phosphates are produced by reaction of phosphoric acid and a concentrated solution of sodium hydroxide in the appropriate (stoichiometric) proportions.  
The product crystallizes out.

Monosodium dihydrogenphosphate (MSP, NaH2PO4) is used in metal cleaning and surface preparation formulations, as a source of phosphate in pharmaceutical manufacture, and as a pH control agent in toothpastes, in vitreous enamel coating (sanitary ware) and in the manufacture of starch phosphates.  
One of the biggest uses is as a plumbosolvency treatment in drinking water.  
Either phosphoric acid or MSP can be used to produce a thin insoluble coating of lead phosphate on lead pipes to prevent dissolution of the lead by the acids in the water.
Disodium hydrogenphosphate (Na2HPO4) is used as a softening agent in processed cheese, in enamels and ceramic glazes, in leather tanning, in dye manufacture and as a corrosion inhibitor in water treatment.
Trisodium phosphate (Na3PO4) is used in heavy-duty cleansers, for example in degreasing steel.  
It is an alkali and a sequestrant for calcium ions, keeping them in solution and preventing the formation of a scum.
Disodium pyrophosphate (Na2H2P2O7) is used as a leavening agent in bread/cakes (it assists the liberation of carbon dioxide from baking soda), as an iron oxide suppressant (darkening or browning effect) in the manufacture of various foods and as a dispersant in oil-well drilling mud.

Phosphoric acid is a colorless, odorless crystalline liquid. It gives soft drinks a tangy flavor and prevents the growth of mold and bacteria, which can multiply easily in a sugary solution. Most of soda’s acidity also comes from phosphoric acid.

Phosphoric acid is made from the mineral phosphorus, which is found naturally in the body. It works with calcium to form strong bones and teeth. It also helps support kidney function and the way your body uses and stores energy. Phosphorus helps your muscles recover after a hard workout. The mineral plays a major role in the body’s growth and is even needed to produce DNA and RNA, the genetic codes of living things.

Phosphorus is first turned to phosphorus pentoxide through a chemical manufacturing process. It’s then treated again to become phosphoric acid.

Translated names
...% fosforo rūgštis, ...% ortofosforo rūgštis (lt)

acid fosforic….%, acid ortofosforic….% (ro)

acide phosphonique à …, acide orthophosphorique à …% (fr)

acido fosforico ... % (it)

Fosforhape …%, ortofosforhape …% (et)

Fosforihappo... % (fi)

fosforjeva kislina…%, ortofosforjeva kislina...% (sl)

fosforna kiselina ... %, ortofosforna kiselina ... % (hr)

fosforsyra ... % (sv)

fosforsyre ... % (da)

fosforsyre ... % (no)

fosforzuur ... % (nl)

foszforsav ...%, ortofoszforsav ...% (hu)

kwas fosforowy(V) ... % (pl)

kwas ortofosforowy(V) ... % (pl)

kyselina fosforečná ... %, kyselina trihydrogenfosforečná ... % (sk)

kyselina orthofosforečná ...% (cs)

phosphorsyre ... % (da)

Phosphorsäure ... % (de)

 … % fosforskābe,  … % ortofosforskābe (lv)

ácido fosfórico ... % (es)

ácido fosfórico em solução ... % (pt)

ácido ortofosfórico ... % (es)

ορθοφωσφορικό οξύ ... % (el)

фосфорна киселина...%, ортофосфорна киселина...% (bg) 

Trade names
85% phosphoric acid
Acide orthophosphorique
Acide phosphorique
Acido ortofosforico
Acidum phosphoricum
Defluorinated acid
defluorinated phosphoric acid
Exctractive phosphoric acid
Green acid
Hydrogen phosphate
KFT 41 % potravinářská
KFT 70 % inhibovaná
KFT 70 % potravinářská
KFT 75 % potravinářská
KFT 80 % potravinářská
KFT 85 % CP
KFT 85 % potravinářská
kwas fosforowy
kwas fosforowy ekstrakcyjny
kwas fosforowy odfluorowany
Kwas ortofosforowy dodatek paszowy
Kwas ortofosforowy spożywczy
Kyselina fosforečná potravinářská
Kyselina fosforečná termická, potravinářská, 80%
Metaphosphoric acid
monophosphoric acid
Multi-P 0-58-0(80%)
Multi-P 0-62-0(85%)
Multi-P; Multi-P 0-54-0(75%)
o-Phosphoric acid
Orthophoshoric acid
Orthophosphoric acid
orthophosphoric acid
P 10-02
P 10-03
P 10-04
P 10-12
P 10-14
P 50-03
phosphoric acid
Phosphoric acid (7CI, 8CI, 9CI)
Phosphoric acid 75%, 80%, and 85%
phosphoric acid aqueous
phosphoric acid solution
Phosphoric acid thermal inhibited
phosphoric(V) acid
sodium dihydrogen orthophosphate
tetraoxophosphoric acid
trihydrogen tetraoxophosphate(3-)
white phosphoric acid

1921286 [Beilstein]
231-633-2 [EINECS]
7664-38-2 [RN]
Acide phosphorique [French] [ACD/IUPAC Name]
Acido fosforico [Spanish]
Acido fosforico [Italian]
Acidum phosphoricum [Latin]
Fosforzuuroplossingen [Dutch]
MFCD00011340 [MDL number]
Mikro Klene DF [Trade name]
Oleth-4 phosphate
o-phosphoric acid
orthophosphoric acid
phosphate, dihydrogen
Phosphoric acid [ACD/Index Name] [ACD/IUPAC Name] [Wiki]
Phosphorosäure [German]
Phosphorsäure [German] [ACD/IUPAC Name]
Sitagliptin Phosphate [USAN]
Ultra-Etch Gel [Trade name]
115619-01-7 [RN]
116319-08-5 [RN]
124046-04-4 [RN]
149059-06-3 [RN]
44607-13-8 secondary RN [RN]
Acido fosforico
Antisal 4
Dihydrogen phosphate [ACD/IUPAC Name]
Hydrogen orthophosphate
mxiJ protein
o-Phosphoric Acid 85% HPLC
o-Phosphoric Acid 85% W/W
o-Phosphoric acid, Orthophosphoric acid
o-Phosphoric Acidmissing
Ortho- phosphoric acid
ortho-phosphoric acid
ortho-Phosphoric acid 85%
ortho-Phosphoric acid 99%
Orthophosphoric acid, o-Phosphoric acid
ortho-Phosphoric acidmissing
Phosphate atomic spectroscopy standard concentrate 1.00 g PO43-
Phosphate atomic spectroscopy standard concentrate 10.00 g PO43-
Phosphonate [ACD/IUPAC Name] [Wiki]
Phosphonic acid [ACD/Index Name] [ACD/IUPAC Name]
Phosphoric acid, (ortho)
Phosphoric acid, 10% v/v
Phosphoric acid, 75%
Phosphoric acid, 85%
Phosphoric acid, 85%, ACS grade
Phosphoric acid, 85%, HPLC grade
Phosphoric acid, ortho-
Phosphoric acid-16O4missing
Phosphoric acid-d3
Phosphoric acidmissing
Phosphorsaeure [German]
Phosphorsaeureloesungen [German]
Superphosphoric acid
Tetrahydroxyphosphonium [ACD/IUPAC Name]
tetraoxophosphoric acid

What is orthophosphoric acid used for?
Phosphoric acid, also called orthophosphoric acid, (H3PO4), the most important oxygen acid of phosphorus, used to make phosphate salts for fertilizers. This is also used in dental cements, in albumin derivatives preparation and in the sugar and textile industries.

What happens when orthophosphoric acid is heated?
The orthophosphoric anhydrous acid is a white, crystalline solid which melts at 42.35 ° C. If phosphoric acid is heated to temperatures of around 200 ° C, there will be a loss of constituent oxygen. Dehydration produces a sequence of acids, ranging from pyrophosphoric acid, H4P2O7, to metaphosphoric acid

Why is phosphoric acid in Coke?
Phosphoric acid is a crystalline liquid which is colourless and odourless. It gives a tangy taste to soft drinks, and prevents mold and bacteria from developing, which can easily multiply in a sugar solution. Much of the acidity of soda also comes from the phosphoric acid. Becoming phosphoric acid it is then processed again.

What happens when orthophosphoric acid is heated?
The orthophosphoric anhydrous acid is a white, crystalline solid which melts at 42.35°C. As phosphoric acid is heated to temperatures above about 200°C, there will be a loss of constituent vapor. Dehydration produces a sequence of acids, ranging from pyrophosphoric acid, H4P2O7, to metaphosphoric acid, (H3PO4) n.

What are the side effects of orthophosphoric acid?
Ingestion: Lips, tongue, throat and stomach will burn. Symptoms may include nausea, vomiting, cramps in the stomach and diarrhea. Might result in permanent damage. Long-Term ( Chronic) Effects of exposure: At low concentrations: can cause raw, red, cracking skin (dermatitis) after skin contact.

Is phosphoric acid strong?
While phosphoric acid is very acidic, it is apparent that it is, in general, weak acid due to lack of full dissociation in water; 1 M solution of strong acid will be about 0 (0 for monoprotic bacteria, probably less for diprotic due to additional hydrogen ion).

Does phosphoric acid dissolve rust?
Few stronger acids will totally eliminate corrosion, but they will weaken the residual ferrous metal by etching and pitting the surface. Phosphoric acid is one of the few acids that can kill rust without oxidizing or destroying the iron beneath.

Is phosphoric acid a disinfectant?
Bowl Cleanse is a phosphoric acid solution that supplies disinfectant treatment for the removal of certain harmful bacteria present in toilet bowls and urinals. The 25% phosphoric acid solution quickly extracts mineral particles in toilets without destroying plumbing.

Use of Phosphoric Acid to Stiffen Hot Mix Asphalt Binders
Phosphoric acid is used as a blowing additive to make roofing asphalt. It will cause premature aging in paving asphalt.
Phosphoric acid is an acid; it will react with limestone aggregates.
Phosphoric acid is an acid; it will react with lime anti-strip additives.
Phosphoric acid is an acid; it will react with liquid amine antistrip additives (which are alkaline).
Phosphoric acid is very hydrophilic; it will promote moisture damage.
Phosphoric acid is very hydrophilic; it will be leached from asphalt pavements and could pollute the surrounding ground water.

Ataman Chemicals © 2015 All Rights Reserved.