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Phosphorous Acid

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Chemical Name: Phosphorous acid
Molecular Formula: H3PO3
Molecular Weight: 82.00
CAS No.: 13598-36-2
UN: 2834
CLASS: 8.1
Properties
Colorless or white crystals.
Relative density is 1.651 kg/L.
Melting point is 74 ℃.
Boiling point is 200 ℃.
Soluble in water and alcohol.
Strong hygroscopicity and can deliquesce to orthophosphoric acid.
Decomposed into hydrogen phosphide and orthophosphoric acid at 180℃.
Phosphorous acid has a strong reduction, the silver ions readily (Ag+) is reduced to metallic silver (Ag), can restore the sulfuric dioxide.
Strong hygroscopic and deliquescent, corrosive acid.

Items
Specifications
Appearance
White crystals
Assay
99.0% min.
Cl
0.01% max.
Fe
15 ppm max.
SO4
0.008% max.
Phosphate salt
0.6% max.
Heavy metals
10 ppm max.

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