Sodium Dihydrogen Phosphate

Sodium Dihydrogen Phosphate

CAS Number:7558‑80‑7 (anhydrous) / 13472‑35‑0 (dihydrate)

Synonyms:Monosodium phosphate; Sodium phosphate monobasic; Sodium dihydrogen phosphate; Sodium phosphate monobasic dihydrate

Chemical Formula:NaH₂PO₄ · 2H₂O (dihydrate)

Molecular Weight: 119.98 g/mol (anhydrous); 156.01 g/mol (dihydrate)

Product Introduction

A white crystalline powder or granules, available in mono- and dihydrate forms. It’s a versatile buffer, pH adjuster, and phosphate source used across laboratory, pharmaceutical, food, and industrial settings.

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Physical & Chemical Properties

Property Value
Appearance White powder/crystals (anhydrous or dihydrate)
Density ~2.36 g/cm³ (anhydrous); ~1.915 g/cm³ (dihydrate)
Melting Point ~60 °C (dihydrate); higher for anhydrous
Solubility in Water (anhyd.) ~59.9 g/100 mL @ 0 °C
pKₐ (dihydrogen phosphate) ~6.8–7.2
Purity ACS/USP/FCC grade available—98–100.5% assay

Applications

  • Laboratory/biopharma: buffer systems, downstream processing, analytical reagents
  • Pharmaceutical: excipient, buffering agent, pH adjuster in formulations
  • Food/feed:: phosphate additive, nutrient source
  • Industrial: water treatment, cleaning, buffering, metal finishing

Safety & Handling:

  • Low hazard; use PPE to avoid dust contact. Store sealed, in a cool, dry environment. NON‑oxidizing.

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