Chemical Name: Phosphorous acid
Molecular Formula: H3PO3
Molecular Weight: 82.00
CAS No.: 13598-36-2
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.
15 ppm max.
10 ppm max.