Aqueous solution of orthoboric acid can be titrated against
sodium hydroxide using phenolphthalein indicator only in
presence of –
(a) trans-glycerol (b) catechol
(c) cis-glycerol (d) Both (b) and (c)
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Answer:
Aqueous solution of ortho-boric acid can be titrated against sodium hydroxide using phenolphthalein indicator only in presence of catechol and cis-glycerol. Ortho-boric acid forms a stable cyclic complex with polyhydroxyl compounds like catechol and cis-glycerol. Boric acid acts as a strong acid and hence can be titrated against NaOH with phenolphthalein.
Hence,option D is correct.
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