Potassium bitartrate, also known as potassium hydrogen tartrate, with formula KC4H5O6, is a byproduct of winemaking. In cooking, it is known as cream of tartar. It ...
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is processed from the potassium acid salt of tartaric acid (a carboxylic acid). The resulting powder can be used in baking or as a cleaning solution (when mixed with an acidic solution such as lemon juice or white vinegar).