Phosphorous acid (H3PO2) is a colorless liquid with special chemical properties. The following is an introduction to some properties, uses, production methods and safety information of phosphorous acid:

Nature:
Phosphorous acid dissolves in water to form a phosphorous acid solution, which shows strong reducing properties.
Phosphorous acid can be oxidized into inorganic acid phosphoric acid (H3PO4).
Phosphorous acid is a relatively weak acid and reacts with bases to form phosphite.

Purpose:
Phosphorous acid is widely used as an important intermediate in the synthesis of chemicals.
It is used in the production of agricultural chemicals such as pesticides, insecticides, fungicides and glyphosate.
Phosphorous acid can also be applied in the electroplating industry, for silver plating, nickel plating, metal gloss agents, etc.

Preparation:
Phosphorous acid can be prepared by the reaction of phosphoric acid with sulfurous acid, thionyl chloride, etc.
Phosphorous acid can also be produced by the reaction of transient silver phosphate with sodium sulfite.

Safety information
Phosphorous acid is a corrosive substance. Contact with the skin and eyes may cause burns.
When handling and using phosphorous acid, protective gloves, goggles and protective clothing should be worn, and good ventilation conditions should be maintained.
When phosphorous acid comes into contact with oxidants, chloric acid, nitric acid and other substances, it may undergo violent reactions, posing a danger.
Liquid phosphorous acid should be stored in a sealed container and kept away from fire sources and oxidants during storage and handling.