Aqueous solution of orthoboric acid can be titrated against sodium hydroxide using phenolphthalein indicator only in presence of :

Question

Aqueous solution of orthoboric acid can be titrated against sodium hydroxide using phenolphthalein indicator only in presence of :

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 )

Monjur Alahi

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2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - D
It forms a stable cyclic complex with polyhydroxy compounds like cis-glycerol, cathechol, etc. This helps in the release of `H^+` as `H_3O^+` and , therefore, boric acid acts as a strong acid and hence can be titrated with sodium hydroxide using phenolphthalein.

5 views Answered 2023-02-05 15:29