Sodium dihydrogen phosphate - NaH2PO4

What is Sodium dihydrogen phosphate?

Sodium dihydrogen phosphate is an inorganic monobasic sodium phosphate compound with the chemical formula NaH2PO4. Sodium dihydrogen phosphate is a derivative composed of glycerol derivatives formed by reacting mono and diglycerides that are derived from edible sources with phosphorus pentoxide followed by neutralization with sodium carbonate. Sodium dihydrogen phosphate is a soluble form of phosphate that can be administered intravenously.

Other names – Monobasic sodium phosphate, Monosodium phosphate (MSP)

NaH2PO4 Sodium dihydrogen phosphate
Density 2.36 g/cm3 (anhydrous)
Molecular Weight/ Molar Mass 119.98 g/mol
pKa 6.8-7.2
Melting Point 212.0oC
Chemical Formula NaH2PO4

Sodium dihydrogen phosphate Structure – NaH2PO4

Sodium dihydrogen phosphate

Physical Properties of Sodium dihydrogen phosphate – NaH2PO4

Odour Odourless
Appearance White powder or crystals
Complexity 61.9
pH 8.0 and 11.0
Solubility in water Soluble in water; insoluble in alcohol

Chemical Properties of Sodium dihydrogen phosphate – NaH2PO4

    • Sodium dihydrogen phosphate reacts with base like sodium hydroxide resulting in the formation of sodium hydrogen phosphate and water.

NaH2PO4 + NaOH → Na2HPO4 + H2O

    • Sodium dihydrogen phosphate reacts with acid like hydrochloric acid results in the formation of phosphoric acid and sodium chloride.

NaH2PO4 + HCl → H3PO4 + NaCl

Uses of Sodium dihydrogen phosphate – NaH2PO4

  • Used for water treatment were generally safe, high concentrations had the potential for interfering with human essential trace metal metabolism.
  • Phosphorus in domestic sewage may be derived from human wastes, waste food (primarily from household garbage- disposal units), and synthetic detergents.
  • Reducing the amount of phosphorus reaching the sewage treatment works by concerted public campaigns can reduce the costs of stripping gas or vapor from a foam.
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