Potassium sodium tartrate

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Colorless crystals that is also called Rochelle salts. Potassium sodium tartrate is used in baking powders and in the manufacture of silver mirrors. The complex organic salt has also been used to remove corrosion from bronzes (Lucas 1932).

Synonyms and Related Terms

Rochelle salt; alkaline Rochelle salt; sodium potassium tartrate; Seignette salt; 2,3-dihydroxy-[R-(R*,R*)]-butanedioic acid, monopotassium monosodium salt

Other Properties

Soluble in water. Insoluble in ethanol.

Composition KNaC4H4O6 - 4H2O
CAS 304-59-6
Melting Point 70-80
Density 1.77
Molecular Weight mol. wt. = 210.16

Hazards and Safety

Mallinckrodt Baker: MSDS

Sources Checked for Data in Record

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 68
  • Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
  • Website address 1 Comment: termlist for conservation - www.hants.org.uk/museums

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