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Phosphorous acid

CAS NO13598-36-2

Mol. WT.82.00

Mol. Formula

Structure

Properties
Specification
Usage
Safety
Package&Storage

Phosphorous acid is soluble in water and alcohol. 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 stronger acidity than phosphoric acid. Its strong reducibility enable it to easily reduce Ag+ to metal silver and sulfuric acid to sulfur. . It is corrosive, deliquescent and fairly hygroscopic. Phosphorous acid is widely used as the raw materials to produce phosphorous acid salt and plastic stabilizer in the plastic industry, and as reducer in chemical reaction. Phosphorous acid is also used in the synthetic fibre and pesticide industry etc.

Items	Top Grade	Grade A	Grade B
Appearance	White crystalline powder
Main Content（H₃PO₃），%	99.0 min	99.0 min	98 min
Iron Content，%	0.001 max	0.0015 max	0.002 max
Sulfate Content (SO₄^2-) ，%	0.001 max	0.002 max	0.002 max
Arsenic Content，%	0.0001 max	0.0001 max	0.0001 max
Phosphate Content（PO₄^3-), %	0.1 max	0.2 max	0.2 max
Chloride Content（Cl），%	0.008 max	0.01 max	0.01 max

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