Acids pH buffers quiz for A Level chemistry: 10 questions with answers

by aicko
28 October 202628 October 2026

Quick answer: A Brønsted–Lowry acid donates a proton and a base accepts one. This Chemistry 11-12 quiz checks acids pH buffers with 10 multiple-choice questions and instant feedback; every answer comes with a short explanation.

Acids pH buffers quiz for A Level chemistry: 10 questions with answers

This acids pH buffers quiz for chemistry grades 11-12 has quick multiple-choice questions with instant feedback. Need a refresher first? Read the lesson or do the worksheet on acids pH buffers.

Ten multiple-choice questions on acid strength, pH, buffers and titration curves. Choose one option for each, then read the explanation, which names the usual mistake.

Level: Chemistry grades 11-12 (A Level · IB · Class 11-12) · Curriculum: IB R3.1

Contents

Acids pH buffers quiz: the questions

What is a Brønsted–Lowry base?

What is the pH of 0.010 mol/dm³ hydrochloric acid?

At 25 °C a solution has pOH 3.0. What is its pH?

Which acid is the strongest?

What is the formula for the pH of a weak acid of concentration c?

A buffer contains 0.1 mol/dm³ of a weak acid and 0.1 mol/dm³ of its conjugate base. What is its pH?

Which pair makes a buffer?

At the half-equivalence point of a weak acid titration with NaOH, what is true?

Why does a buffer resist addition of OH⁻?

Which indicator suits a titration of ethanoic acid with sodium hydroxide?

Brønsted–Lowry acid? — A proton (H⁺) donor.

Brønsted–Lowry base? — A proton (H⁺) acceptor.

Formula for pH? — pH = −log₁₀[H⁺]

Kw at 25 °C? — 1.0 × 10⁻¹⁴ mol²/dm⁶

pH + pOH at 25 °C? — 14

Ka expression for HA? — Ka = [H⁺][A⁻] / [HA]

Weak acid [H⁺] approximation? — [H⁺] ≈ √(Ka × c)

Henderson–Hasselbalch equation? — pH = pKa + log([A⁻]/[HA])

pH at half-equivalence? — pH = pKa

Lower pKa means what? — A stronger acid, larger Ka.

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