Sodium citrate

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A white crystalline or granular material. Sodium citrate is used as a buffering agent in photographic solutions. It is also used as a Chelating agent to remove soluble metals ions from solutions.

Synonyms and Related Terms

trisodium citrate; citrosodine; Citnatrin; Urisal



Chemical structure

Sodium citrate.jpg

Physical and Chemical Properties

Soluble in water forming a solution with a pH of about 8. Insoluble in ethanol.

Composition Na3C6H5O7 - 2H2O
CAS 68-04-2
Molecular Weight mol. wt. = 258.1


  • Combustible.
  • Contact may cause irritation.
  • ThermoFisher: SDS

Resources and Citations

  • Marie Svoboda, Conservation Survey Index, unpublished, 1997
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 455
  • The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 8746
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997