SODIUM TARTRATE (sal tartar; disodium tartrate) Na2 C4 H4 O6 · 2HOH CAS:868-18-8 Properties:  White crystals or granules, soluble in water, insoluble in alcohol, d 1.794, loses 2HOH at 150C. Derivation:  Neutralization of tartaric acid with sodium carbonate, concentration, and crystallization. Grade:  Technical, CP, reagent, FCC. Use:  Reagent, food additive, as sequestrant and stabilizer.