The pH of buffer solution containing 0.05 mol NaF per litre and 0.01 mol HF per litre (pKa = 3.1427) is ____.

Q.1 (vii) The pH of buffer solution containing 0.05 mol NaF per litre and 0.01 mol HF per litre (pK_a = 3.1427) is ____.

A. 3.8417

B. 3.1427

C. 0.3841

D. 0.0384

Doubtly Asked 28 Oct 2026 Board exam · June 2026 hsc 12th Save WhatsApp Report

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Answer: A. 3.8417

Answer: (a) 3.8417

Henderson–Hasselbalch equation for an acidic buffer:

\(\text{pH} = \text{p}K_a + \log_{10}\dfrac{[\text{salt}]}{[\text{acid}]} = 3.1427 + \log_{10}\dfrac{0.05}{0.01} = 3.1427 + \log_{10}5 = 3.1427 + 0.6990 = 3.8417\)

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report

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The pH of buffer solution containing 0.05 mol NaF per litre and 0.01 mol HF per litre (pKa = 3.1427) is ____.

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