D-Tartaric acid CAS 147-71-7 exists in three stereoisomers: tartaric acid, levo-tartaric acid and meso-tartaric acid. The optically active phases of a mixture of equal amounts of dextro- and levorotatory bodies cancel each other out, which is called racemic tartaric acid. Meso does not exist in nature and can be synthesized chemically. All kinds of tartaric acid are colorless crystals that are easily soluble in water..
