Sodium and Potassium Tartrate, also known as Rochelle Salt, comes in the form of translucent crystals. Randi Group is a supplier and producer of sodium and potassium tartrate for industrial use, particularly in the food industry, where it is known by the code E337, and in the pharmaceutical, galvanic and construction industries.
E337 ROCHELLE SALT / SEIGNETTE SALT CAS REG No. 304-59-6 EINECS No. 206-156-8
SYNONYMS
Potassium Sodium Tartrate
CHEMICAL NAME
Sodium and potassium salt of L-2,3-dihydroxybutanedioic acid
CHEMICAL FORMULA C4H4KNaO6.4H2O
MOLECULAR WEIGHT 282.23
DESCRIPTION White crystalline powder or transparent colourless crystals. Highly soluble in water, practically insoluble in alcohol. It is a natural L(+) tartaric acid salt.
DEFINITION (+)-(2R,3R)-2,3-dihydroxybutanedioate potassium sodium tetrahydrate. Content: from 98.0 percent to 101.0 percent (anhydrous substance).
Translucent tetrahydrate crystals. Melting point 70 - 80 °C. At 100 °C, it loses three molecules of water; it becomes anhydrous at 130 - 140 °C; at 220 °C it begins to decompose. Soluble in 0.9 parts water. The aqueous solution is weakly alkaline
IDENTIFICATION
Responds to the specific rotation power test Tests positive for tartrates Tests positive for potassium Tests positive for sodium
ALTERAZIONI DI STATO None
SPECIFIC WEIGHT (25°C) 1.1 g/ml
SOLUBILITY IN WATER 1.47 g/ml of H2O
PH VALUE (1,47 G/ML DI H2O, 25°C) 6.5 - 8.5
FUSION POINT between 70 and 80 °C
