Sodium Citrate

Sodium Citrate

CAS Number:68‑04‑2 (trisodium citrate)

Synonyms:Trisodium citrate; Disodium citrate; Monosodium citrate; Citric acid, sodium salt

Chemical Formula:Na₃C₆H₅O₇ (anhydrous)

Molecular Weight: 258.07 g/mol

Product Introduction

A white, odorless crystalline powder or granules that’s deliquescent in moist air. Its salty and mildly tart taste makes it a popular food additive, buffering and alkalizing agent, and anticoagulant. Trisodium citrate is the most common form.

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Physical & Chemical Properties

Property Value
Appearance White crystalline powder/granules
Solubility in Water ~57 g/100 mL @ 25 °C (anhydrous)
Solubility in Alcohol Insoluble
Melting Point/Decomp. ≥ 300 °C (decomposes)
pH (1 % solution) ~7.5–9.0
pKₐ values 3.14, 4.77, 6.39
Density ~1.9–2.0 g/cm³

Applications

  • Food & beverage: flavor enhancer, emulsifier in cheese, acidulant in drinks, prevents milk curdling
  • Medical/blood:anticoagulant in blood collection/storage, urine alkalizer, treatment of metabolic acidosis
  • Pharma/cosmetics: buffering agent, chelator, pH regulator in formulations
  • Laboratory: buffer component, chelating agent, nanoparticle synthesis

Safety & Handling:

  • GRAS and generally regarded as safe. Low hazard; dust may irritate eyes and respiratory tract. Store sealed in dry conditions.

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