Monosodium tartrate or sodium bitartrate is a sodium acid salt of tartaric acid. Other commercial choline salts are choline hydroxide and choline bitartrate. Upon dissolution in acid, potassium bitartrate will dissociate into acid tartrate, tartrate, and potassium ions. Choline chloride and choline bitartrate are used in dietary supplements. Potassium bitartrate and the neutral calcium tartrate at the pH of the wine. The principal component of this deposit is potassium bitartrate, a potassium salt of tartaric acid. The salts in use are the bitartrate (free base conversion ratio 0.643) and hydrochloride (0.770). Potassium bisulfate is commonly used to prepare potassium bitartrate for winemaking. A variety of acidifiers can be used, including potassium bitartrate, tartaric acid, and disodium phosphate. Bitartrate is an anion which is the conjugate base of tartaric acid. Ammonium ion when added to Potassium bitartrate gives a white precipitate. Potassium bitartrate has a low solubility in water. Warm solutions of potassium chlorate and ammonium bitartrate are needed in warm solutions. It is often confused with potassium bitartrate, also known as cream of tartar. Potassium bitartrate is the NIST's primary reference standard for a pH buffer.