KC6H5COO

KC6H5COO represents the chemical formula for potassium benzoate. Benzoate is the anion derived from benzoic acid, which is a simple aromatic carboxylic acid. The formula indicates a potassium cation (K+) bonded to a benzoate anion (C6H5COO-). Potassium benzoate is the potassium salt of benzoic acid.

This compound is commonly used as a food preservative. It functions by inhibiting the growth of molds, yeasts, and some bacteria, particularly in acidic foods like fruit juices, carbonated drinks, jams, and pickles. Its effectiveness is pH-dependent, with greater antimicrobial activity at lower pH values.

Potassium benzoate is typically found as a white crystalline powder that is soluble in water. In the food industry, it is often identified by its E number, E212. It is generally recognized as safe (GRAS) by regulatory bodies when used within established limits. Concerns have been raised about the potential formation of benzene, a carcinogen, when potassium benzoate is mixed with ascorbic acid (vitamin C) in certain conditions, such as in the presence of light and heat. However, this reaction is generally minimized through careful formulation and storage. Beyond food, it can also be found in some pharmaceuticals and cosmetics.

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