Synonyms: Potassium sodium tartrate, Rochelle salt, sodium-potassium double salt of tartaric acid
Chemical formula: KNaC4H4O6 * 4H2O
International name: POTASSIUM-SODIUM TARTRATE
CAS No: 6381-59-5
Appearance: colorless crystals in a mass of white color
Packing: bags of 25 kg
Storage: Store in a dry, well-ventilated area
Potassium sodium tartrate (potassium sodium tartrate, Rochelle salt) - colorless crystals of the orthorhombic system. Potassium sodium tartrate melts at 70-80 ° C in water of crystallization. At 100 ° C the monohydrate becomes KNaC4H4O6 · H2O, at 130 ° C. loses water last molecule. At higher temperatures the reagent decomposes with evolution of CO and H2O; remaining charred mass on ignition forms KNaCO3.
Salt is highly soluble in water (35.4% at 20 ° C) insoluble in ethanol.
Potassium sodium tartrate was prepared by reacting equivalent amounts of potassium carbonate and sodium salts with tartaric acid:
K2CO3 + Na2CO3 + 2H2C4H4O6 = 2KNaC4H4O6 + + 2H2O 2CO2b
Potassium sodium tartrate used
• as a component for electroplating baths, with silvered mirrors,
• in radio,
• in medicine
• in the food industry as an emulsifier in cheese and others.