How to Test for Potassium Sorbate

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    • 1). Add one ml. of acetone to the sample. Dissolve the sample in dilute hydrochloric acid. The potassium sorbate will ionize to form sorbic acid in the chemical solution.

    • 2). Dissolve the sample in water. If it is potassium sorbate, it will release sorbic acid.

    • 3). Collect the precipitated sorbic acid on a filter paper.

    • 4). Wash the filter paper free of chloride with water, and dry it under a vacuum over sulfuric acid.

    • 5). Add a few drops of bromine solution. The color of the bromine solution disappears immediately.

    • 6). Observe to see if there is potassium salt (cystalline powder that is white or slightly yellow), on the filter paper. Potassium sorbate is the potassium salt of sorbic acid.

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