Also known as Disodium Hydrogen Phosphate, Disodium Phosphate or Sodium Hydrogenphosphate, this white granular powder is soluble in water but insoluble in alcohol. It is stable, incompatible with strong acids and hygroscopic. As a laboratory chemical it is a reagent and emulsifier with a very high buffering capacity. Store at room temperature and protect from moisture, though it is acceptable to freeze.
Molecular Formula
Molecular Weight
CAS Number
Na2HPO4
141.96
7558-79-4
Solubility
Easily soluble in hot water.
Soluble in cold water.
Solubility in Water: 120 g/L @ 25 deg. C.
Insoluble in alcohol.
Reactivity
Hygroscopic; keep container tightly closed.
Incompatible with magnesium, alkaloids, antipyrine, chloral hydrate, lead acetate, pyrogallol, resorcinol, strong mineral acids, strong organic acids.
