PHOSPHOROUS ACID
Phosphorous acid, or phosphonic acid, is the compound described by the formula H3PO3.
Phosphorous acid is used in the following products: fertilizers, biocides (e.g., disinfectants, pest control products), lubricants and greases, plant protection products, washing & cleaning products, pH regulators and water treatment products, and photochemicals.
Phosphorous acid (H3PO3), also called orthophosphorous acid, is one of several oxygen acids of phosphorus, used as a reducing agent in chemical analysis
Phosphorous acid 70% is used to make phosphonates ( HEDP, ATMP, and DTPMP) for water treatment and oilfield applications and stabilizers for PVC.
Phosphorous acid 70% is used for the manufacture of phosphonates (used in detergents and as water conditioners), inorganic phosphites (used as stabilizers), and for the production of agrochemicals and pharmaceuticals.
Phosphorous acid is an intermediate in the preparation of other phosphorus compounds.
Organic derivatives of phosphorous acid, compounds with the formula RPO3H2, are called phosphonic acids.
IUPAC name: Phosphonic acid
Systematic IUPAC name: Phosphorous acid
CAS Number: 13598-36-2
EC / List no.: 237-066-7
CAS no.: 13598-36-2
Mol. formula: H3O3P
APPLICATION FIELDS OF PHOSPHOROUS ACID
Adhesives and sealant chemicals
Agricultural chemicals
Corrosion inhibitors and anti-scaling agents
Lubricants and lubricant additives
Not Known or Reasonably Ascertainable
Other names
Dihydroxyphosphine oxide
Dihydroxy(oxo)-λ5-phosphane
Dihydroxy-λ5-phosphanone
Orthophosphorous acid
Oxo-λ5-phosphanediol
Oxo-λ5-phosphonous acid
Metaphosphoroic acid
Physical Properties of Phosphorous Acid 70%:
Density 20°C, kg/ m³: Approx. 1415
Specifications:
Appearance Clear colorless liquid
Assay w/w % 70-72
Halogen as Cl– mg/kg 100 Max
Iron mg/kg 10 Max
Orthophosphate w/w % 0.2 Max
Physical Properties of Phosphorous Acid 99 % :
Chemical formula: H3PO3
Molar mass: 81.99 g/mol
Appearance: white solid deliquescent
Density: 1.651 -1.800 g/cm3 (21 °C)
Melting point: 73.6 °C (164.5 °F; 346.8 K)
Boiling point: 200 °C (392 °F; 473 K) (decomposes)
Solubility in water: 310 g/100 mL
Solubility: soluble in ethanol
Acidity (pKa): 1.1, 6.7
Magnetic susceptibility (χ): −42.5·10−6 cm3/mol
Specifications:
Assay w/w % 99.0 Min
Halogen as Cl– mg/kg 100 Max
Iron mg/kg 20 Max
Translated names
acid fosfonic (ro)
acide phosphonique; (fr)
acido fosfonico (it)
Fosfonihappo (fi)
fosfono rūgštis (lt)
fosfonska kislina (1) (sl)
fosfonskābe (lv)
fosfonzuur (nl)
Fosfoonhape (et)
fosforsyrlighet (sv)
fosforsyrling (no)
foszfonsav (hu)
kwas fosfonowy (pl)
kyselina fosforitá (sk)
Phosphonsäure (de)
trihydroxophosphor (da)
àcido fosfónico (es)
ácido fosfónico (pt)
φωσφονικό οξύ (el)
фосфониева киселина (bg)
IUPAC names
acido triossofosforico
Also known as Phosphorous acid
Dihydrogenphosphonat
dihydroxy(oxo)phosphanium
PHOSPHONIC ACID
Phosphonic Acid
Phosphonic acid
phosphonic acid
Phosphonic Acid
Phosphonic acid
phosphonic acid
phosphonic acid;
Phosphonic acid; Phosphorous acid
Phosphor(III)säure
Phosphorous acid
phosphorous acid
Phosphorous Acid
Phosphorous acid
Potassium phosphite
triossophosphoric acid(III)
Trade names
Fosforigzuur
Orthophosphorous Acid
PA
Phosphonic acid
phosphonic acid
Phosphorige Säure
Phosphorige Säure min. 98,5 %
Phosphorige Säure min. 99,0 %
Phosphorigsäure
Phosphorous acid
Phosphorous Acid (PA)
Phosphorous acid 50%
Phosphorous acid 70%
Phosphorous acid 70% grade
Phosphorous acid 70% solution
Phosphorous acid crystalline
Phosphorous acid flake
PHOSPHOROUS ACID MBP
