Hypophosphorous acid

• Hypophosphorous acid (deprecated)
• Hypophosphorous acid (deprecated)
• Phosphor (I) - acid

Colorless and odorless Papers

Fixed

1.49 g · cm -3

27 ° C

108 ° C ( decomposition)

< 22.6 hPa ( 20 ° C)

• 2.0
• 2.23

Soluble in water

Risk

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Phosphinic acid, outdated also called hypophosphorous acid, is one of the acids of phosphorus and has the molecular formula H3PO2. Its salts are called phosphinates or (deprecated) hypophosphite. The phosphorus in these compounds has an oxidation state of I.

Production

Phosphinic acid can be produced by disproportionation of white phosphorus (P4) in an alkaline medium:

Also possible is the representation by decomposition of Bariumhypophosphit with sulfuric acid.

Properties

Anhydrous hypophosphorous acid crystallizes in colorless leaflets, very slightly soluble in water. When heated to 130-140 ° C enters a disproportionation to monophosphane and phosphonic acid.

Use

Hypophosphorous acid can be used in aqueous solution as a reagent for the reduction of diazonium groups ( dediazoniation ). Reaction products formed elemental nitrogen and phosphorous acid.