C6H5CO2K

Potassium benzoate, with the chemical formula C6H5CO2K, is the potassium salt of benzoic acid. It is a white crystalline solid that is soluble in water. Potassium benzoate is often used as a food preservative, inhibiting the growth of mold, yeast, and bacteria. It is particularly effective in acidic foods, such as fruit juices, pickles, and jams. Its preservative action is attributed to its ability to interfere with cellular metabolism in microorganisms. In its solid form, it is odorless but may have a faint, sweet odor. When dissolved in water, it produces a slightly alkaline solution.

The synthesis of potassium benzoate typically involves the reaction of benzoic acid with potassium hydroxide or potassium carbonate. This neutralization reaction yields potassium benzoate and water. In the food industry, it is designated by the E number E212. While generally recognized as safe when consumed within regulated limits, some individuals may exhibit sensitivity. Its use in food products is governed by regulatory bodies in various countries, which set maximum permissible levels. Beyond its role as a food additive, potassium benzoate may find applications in other areas, such as in certain pharmaceutical preparations or as a laboratory reagent, though these uses are less common than its preservative function.