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plate-like crystal(s); available commercially as a water solution; readily forms hydrates; conc solution decomposes; used in baking powder(s) in the form of the sodium salt [HAW93]

Acid sodium salts in baking powders.

ChEBI: Hypodiphosphoric acid is a phosphorus oxoacid.

Hypophosphoric acid is formed by reaction (1) of yellow phosphorous and potassium permanganate in sodium hydroxide medium, (2) of red phosphorus and calcium hypochlorite solution, (3) also one of the products of slow oxidation at ordinary temperatures of phosphorus in moist air.