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Orthophosphorus acid

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Orthophosphorus acid Basic information

Product Name:
Orthophosphorus acid
Synonyms:
  • Phosphorous acid
  • Phosphorou acid
  • Phosphorous acid 50% aqueous solution
  • Orthophosphorus acid
  • Orthophosphorus acid ISO 9001：2015 REACH
CAS:
10294-56-1
MF:
H3O3P
MW:
82
EINECS:
233-663-1
Mol File:
10294-56-1.mol
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Orthophosphorus acid Chemical Properties

pka
2.22±0.10(Predicted)
CAS DataBase Reference
10294-56-1
NIST Chemistry Reference
H3PO3(10294-56-1)
EPA Substance Registry System
Phosphorous acid (10294-56-1)
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Safety Information

Hazard Codes 
Xn,C
Risk Statements 
22-35
Safety Statements 
1/2-26-36/37/39-45
RIDADR 
UN 2834
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Orthophosphorus acid Usage And Synthesis

Uses

Phosphorous acid is a reducer in chemical reactions and a raw material in the making of phosphorous acid salts. A plant defoliant.

Definition

A white crystalline solid. It is a monobasic acid forming the anion H2PO2- in water. The sodium salt, and hence the acid, can be prepared by heating yellow phosphorus with sodium hydroxide solution. The free acid and its salts are powerful reducing agents.

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