Topic: Buffer solutions· Equilibrium

The pH of the solution containing 50 mL each of 0.10 M sodium acetate and 0.01 M acetic acid is[Given pK_a of CH_3COOH = 4.57]

1. 2.57

2. 5.57

3. 3.57

4. 4.57

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

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Answer: 2. 5.57

Key idea: acetate/acetic acid is an acidic buffer; use the Henderson equation.

\(\mathrm{pH}=pK_a+\log\dfrac{[\mathrm{salt}]}{[\mathrm{acid}]}\)

Equal volumes are mixed, so the ratio stays 0.10 : 0.01 = 10.

\(\mathrm{pH}=4.57+\log 10=4.57+1=5.57\).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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