Sodium Phosphate, Monobasic
Title: Sodium Phosphate, Monobasic
CAS Registry Number: 7558-80-7
Additional Names: Sodium biphosphate; sodium dihydrogen phosphate; acid sodium phosphate; monosodium orthophosphate; primary sodium phosphate
Molecular Formula: H2NaO4P
Molecular Weight: 119.98
Percent Composition: H 1.68%, Na 19.16%, O 53.34%, P 25.82%
Line Formula: NaH2PO4
Literature References: It is about 99% pure.
 
Derivative Type: Monohydrate
Properties: White, odorless, slightly deliquesc crystals or granules. At 100° loses all its water; when ignited it converts into metaphosphate. Freely sol in water; practically insol in alcohol. The aq soln is acid. pH of 0.1 molar aq soln at 25°: 4.5.
 
Derivative Type: Dihydrate
Properties: Orthorhombic bisphenoidal colorless crystals, mp 60°. d 1.915. At room temp crystallizes with 2H2O. Directions for max yield: Beans, Kiehl, J. Am. Chem. Soc. 49, 1878 (1927).
Melting point: mp 60°
Density: d 1.915
 
Use: In baking powders; in boiler water treatment; as dry acidulant and sequestrant for foods: Tidridge, Pals, US 3030213 (1962 to FMC).
Therap-Cat: Urinary acidifier.
Therap-Cat-Vet: Urinary acidifier.

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