Aqueous solution of ortho-boric acid can be titrated against sodium hydroxide using phenolphthalein indicator only in presence of

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Aqueous solution of ortho-boric acid can be titrated against sodium hydroxide using phenolphthalein indicator only in presence of

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trans-glycerol

cis-glycerol

Both (2) and (3)

Catechol

answer is D.

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Detailed Solution

Titration of aqueous solution of boric acid against NaOH is done using phenolphthalein in the presence of polyhydroxy compounds named as catechol and cis-glycerol. Boric acid forms a stable complexes with polyhydroxy compounds which helps in releasing H⁺ and H₃O⁺in the solution This enhances the acidic strength of boric acid and then, it is titrated against NaOH.

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