Orthoboric acid () alone cannot be titrated accurately with because it is a very weak acid. However, it can be titrated as a strong monobasic acid if which of the following is added to the mixture?

Question

Orthoboric acid ($H_3BO_3$) alone cannot be titrated accurately with $NaOH$ because it is a very weak acid. However, it can be titrated as a strong monobasic acid if which of the following is added to the mixture?

Prashant Kotian · Accepted Answer

Correct answer: B. Orthoboric acid behaves as a weak monobasic Lewis acid in water. It cannot be titrated with directly. However, the addition of a cis-diol (like glycerol or mannitol) leads to the formation of a highly stable cyclic chelate complex with the ion, shifting the equilibrium forward and allowing titration.

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