DL-tartaric acid quality indicators
Isomers and performance: tartaric acid molecule has two asymmetric carbon atoms, so there are three optical isomers, L-tartaric acid or D-tartaric acid, D-tartaric acid or L-tartaric acid, meso-tartaric acid. The same amount of L-tartaric acid and D-tartaric acid was racemic mixture of DL-tartaric acid or tartaric acid. Tartaric acid is a natural right-handed tartaric acid. Industrial production is the largest racemic tartaric acid. D-tartaric acid is a colorless transparent crystals or white crystalline powder, odorless, very acid, the relative density of 1.7598. Melting point 168 ~ 170 ℃. Soluble in water, soluble in methanol, ethanol, slightly soluble in ether, insoluble in chloroform. DL-tartaric acid as a colorless fine crystals, no odor, very acid, the relative density of 1.697. Melting point 204 ~ 206 ℃, 210 ℃ decomposition. Soluble in water and ethanol, slightly soluble in ether, insoluble in toluene. Tartaric acid, stable in air. Non-toxic. Quality indicators |
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