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Phosphorous acid is a colorless crystal. It can be slowly oxidized to phosphoric acid in the air. When heated to 180 °C, it can be decomposed into phosphoric acid and phosphine (highly toxic). As a dibasic acid, it has slightly ber acidity than phosphoric acid. Phosphorous acid has b reducibility and can easily reduce Ag+ to metal silver. It can also reduce sulfuric acid to sulfur dioxide. It is corrosive and has b hygroscopicity.
|
|
A Grade |
B Grade |
|
Main Content (based on H3PO3 ) (%) |
≥ 99.0 |
≥ 99.0 |
|
Iron Content (based on Fe) (%) |
≤ 0.001 |
≤ 0.003 |
|
Chloride Content (based on CL) (%) |
≤ 0.01 |
≤ 0.02 |
|
Sulfate Content (based on SO4) (%) |
≤ 0.008 |
≤ 0.01 |
|
Phosphate Content (based on PO4) (%) |
≤ 0.2 |
≤ 0.6 |
|
Appearance |
Pure white crystal |
White crystal |
|
70% Aqueous Solution Test |
Colorless transparent |
Colorless transparent, without impurities |
|
Liquid Phosphorous Acid (%) |
≥ 70-80 |
Colorless, transparent |