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Sodium potassium tartrate (molecular formula KNaC4H4O6·4H2O) is also called potassium sodium tartrate, Roche salt, Rocheer salt, and is a double salt formed by sodium tartrate and potassium tartrate. It is a colorless to blue-white orthorhombic crystal, soluble in water, slightly soluble in alcohol, salty and cool, and the aqueous solution is slightly alkaline. It has a specific gravity of 1.79, a pH of 6.8-8, and a melting point of 70-80 ° C. It is slightly weathered in hot air. At 60 °C, some of the crystal water was lost. At 100 °C, 3 water molecules were lost. At 215 °C, all the crystal water was lost to become anhydrous salt. Potassium sodium tartrate was divided into D type and DL type. D type was colorless. The transparent crystal had a solubility in water of 138.3 g at 100 ° C at 30 ° C. Insoluble in alcohol. It has complexing properties and can form soluble complexes with alkaline ions such as copper, iron, lead, chromium and bromine. The DL type is a white fine-grained crystal having a density of 1.783 g/cm3. The temperature of 100 ° C. It is weathering in hot air, loses part of the crystal water at 60 ° C, and loses all crystal water at 215 ° C. When the solubility in water is 30 ° C, 100 ml is 117.62 g insoluble in alcohol. Has complexation. Two moles of potassium hydrogen tartrate is dissolved in water, and one mole of sodium carbonate is added, filtered while hot, and the insoluble matter is dried and crystallized to obtain potassium sodium tartrate. It can be used as a laxative, food additive, piezoelectric element, or as a chemical reagent for formulating film reagents, biuret reagents, and as a reducing agent for mirroring.
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