A tartrate is a salt or ester of the organic compound tartaric acid, a dicarboxylic acid. The formula of the tartrate dianion is O−OC-CH(OH)-CH(OH)-COO− or C4H4O62−. The main forms of tartrates used commercially are pure crystalline tartartic acid used as an acidulant in non-alcoholic drinks and foods, cream of tartar used in baking, and Roc... Found on http://en.wikipedia.org/wiki/Tartrate