Mono Sodium Phosphate

Monosodium phosphate (MSP), also known as monobasic sodium phosphate and sodium dihydrogen phosphate, is an inorganic compound of sodium with a dihydrogen phosphate (H2PO4−) anion. One of many sodium phosphates, it is a common industrial chemical. The salt exists in an anhydrous form, as well as mono- and dihydrates.


Molar Weight119.98 g/mol
Flash PointNon-flammable
Density2.36 g/cc
FormsWhite, Granules

Uses and Applications

Key applications

  • Buffer agent
  • Food and Nutrition
  • Baking
  • Water treatment
  • Animal feed
  • Cosmetic products
  • Emulsifying agent


  • Cosmetics
  • Food
  • Water Treatment
  • Animal Nutrition

Synonyms: E 339, Monosodium Orthophosphate, Monosodium Phosphate, MSP, Phosphoric Acid Monosodium Salt, Sodium Biphosphate, Sodium Dihydrogen Orthophosphate, Sodium Dihydrogen Phosphate, Sodium Phosphate, Sodium Phosphate Monobasic

Chemical Formula: NaH2PO4

CAS Number: 7558-80-7