Phosphorus acid - H3PO3:
It is made by the action of cold water on phosphorus (III) oxide or phosphorus (III) chloride.
P2O3 + 3H2O → 2H3PO3PCl3 + 3H2O → H3PO3 + 3HClPhysical properties:
It is a white crystalline solid in appearance with garlic taste.Chemical Properties:
1. Acidic nature:
It is a dibasic acid and provides salts of two types.
H3PO3 + NaOH → NaH2PO3 + H2O Sodium dihydrogen PhosphiteH3PO3 + 2NaOH → Na2HPO3 + 2H2O Disodium hydrogen Phosphite2. Whenever it is heated it undergoes auto-oxidation and reduction to made phosphoric acid and phosphine.
3. It is a powerful reducing agent since it has P-H bond. It decreases silver nitrate solution into silver.
2AgNO3 + H3PO3 + H2O → 2Ag +H3PO4 +2HNO3Electronic structure:
Use:
It is utilized as a reducing agent.
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