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 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).
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