Boric acid () alone cannot be titrated accurately with because it is a very weak acid. However, a sharp end point is obtained if which of the following is added to the titration mixture?

Question

Boric acid ($H_3BO_3$) alone cannot be titrated accurately with $NaOH$ because it is a very weak acid. However, a sharp end point is obtained if which of the following is added to the titration mixture?

Prashant Kotian · Accepted Answer

Correct answer: B. Cis-diols (like glycerol or mannitol) form highly stable cyclic chelate complexes with the ion. This removes the borate ion from the solution, driving the equilibrium forward and allowing to be titrated as a strong monobasic acid.

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