What Is the PKa Value of Citric Acid?


Quick Answer

The pKa value of an acid is used to determine the ability of an acid to donate protons in chemical reactions. Weak acids such as citric acid have a high pKa. The pKa of citric acid is 6.5.

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Full Answer

Citric acid occurs in large amounts naturally in citrus fruits. It is used to add a sour taste to food and drinks. It is used to soften water, which makes it useful in manufacturing soaps and cleaning agents. It is a chelating agent that is useful in cleaning limescale in boilers. Citric acid can be used successfully as an alternative to nitric acid in the passivation of stainless steel.

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