Boric acid is a weak acid in aqueous solution. But its acidity increases significantly in the presence of… · ABC26IN0182

Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Exam: CSIR NET 2012 · Marks: 2 · Difficulty: Medium

Boric acid is a weak acid in aqueous solution. But its acidity increases significantly in the presence of ethylene glycol, because
(a)ethylene glycol releases additional $\mathrm{H^{+}}$
(b)$\mathrm{B(OH)_4^{-}}$ is consumed in forming a compound with ethylene glycol.
(c)ethylene glycol neutralizes $\mathrm{H^{+}}$ released by boric acid.
(d)Boric acid dissociates better in the mixed-solvent.
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Ethylene glycol chelates B(OH)₄⁻ as a stable borate ester, pulling the equilibrium B(OH)₃ + H₂O ⇌ B(OH)₄⁻ + H⁺ to the right (b).

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