Di Sodium Phosphate

Disodium phosphate (DSP), or sodium hydrogen phosphate, or sodium phosphate dibasic, is the inorganic compound with the formula Na2HPO4. It is one of several sodium phosphates. The salt is known in anhydrous form as well as forms with 2, 7, 8, and 12 hydrates. All are water-soluble white powders; the anhydrous salt being hygroscopic.


Molar Weight141.96 g/mol (anhydrous) 177.99 g/mol (dihydrate) 268.07 g/mol (heptahydrate)
Melting Point250 °C decomposes
Density1.7 g/cc
FormsPowder, White

Uses and Applications

Key applications

  • Buffer agent
  • Food and Nutrition
  • Water treatment
  • Personal care
  • Animal feed
  • Cosmetic products


  • Animal Nutrition
  • Water Treatment
  • Cosmetics
  • Food

Synonyms: Dibasic Sodium Phosphate, Disodium Monohydrogen Phosphate, Disodium Phosphate, DSP, E 339, Neutral Sodium Phosphate, Phosphoric Acid Disodium Salt, Sodium Phosphate Dibasic

Chemical Formula: Na2HPO4

CAS Number: -