Sodium Phosphates

Sodium Phosphates

Monosodium Phosphate (NaH₂PO₄, sodium dihydrogen phosphate)

CAS Number:7558‑80‑7

Synonyms:Monosodium phosphate; Sodium dihydrogen phosphate; MSP; sodium biphosphate

Chemical Formula:NaH₂PO₄ · xH₂O

Molecular Weight:119.98 g/mol (anhydrous)

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Physical & Chemical Properties

Property Value
Appearance White crystalline powder or crystals
Density ~2.36 g/cm³ (anhydrous)
Solubility (H₂O @0 °C) ~59.9 g/100 mL
pKₐ ~6.8–7.2
NFPA Rating 0‑0‑0 nonflammable

Applications

  • Food & beverages:acidulant, leavening agent
  • Laboratory:buffer solutions in biochemistry
  • Pharma:excipient, electrolyte
  • Water treatment:pH regulator

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