Potassium sorbate is the potassium salt of sorbic acid, chemical formula CH3CH=CH-CH=CH-CO2K. It is a white salt that is very soluble in water (58.2% at 20 °C). It is primarily used as a food preservative. Potassium Sorbate also increases shelf life. Potassium sorbate is effective in a variety of applications including food and wine.