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Benzoic acid is a weak acid, which means that its dissociation is reversible.

C6H5COOH -----> C6H5COO- + H+

At pH 2, there are a lot of H+ ions in the solution. According to Le Chatelier's Principle, the equilibrium will shift to the left to favor the opposite reaction where Benzoic acid is produced, to reduce the amount of H+ in the solution. Therefore, an insignificant amount of benzoic acid will dissociate, while most of it remains in the molecular form.

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Q: Why is benzoic acid is in molecular form at pH of 2?
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