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Acids and bases (A-level only)

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Question 9

Which of the following mixtures of solutions will result in the formation of a buffer solution?

A

40 cm340\text{ cm}^340 cm3 of 0.15 mol dm−30.15\text{ mol dm}^{-3}0.15 mol dm−3 CH3COOH\text{CH}_3\text{COOH}CH3​COOH and 30 cm330\text{ cm}^330 cm3 of 0.20 mol dm−30.20\text{ mol dm}^{-3}0.20 mol dm−3 NaOH\text{NaOH}NaOH

B

25 cm325\text{ cm}^325 cm3 of 0.12 mol dm−30.12\text{ mol dm}^{-3}0.12 mol dm−3 HCl\text{HCl}HCl and 50 cm350\text{ cm}^350 cm3 of 0.06 mol dm−30.06\text{ mol dm}^{-3}0.06 mol dm−3 NH3\text{NH}_3NH3​

C

30 cm330\text{ cm}^330 cm3 of 0.10 mol dm−30.10\text{ mol dm}^{-3}0.10 mol dm−3 CH3COOH\text{CH}_3\text{COOH}CH3​COOH and 20 cm320\text{ cm}^320 cm3 of 0.05 mol dm−30.05\text{ mol dm}^{-3}0.05 mol dm−3 NaOH\text{NaOH}NaOH

D

50 cm350\text{ cm}^350 cm3 of 0.05 mol dm−30.05\text{ mol dm}^{-3}0.05 mol dm−3 HNO3\text{HNO}_3HNO3​ and 50 cm350\text{ cm}^350 cm3 of 0.05 mol dm−30.05\text{ mol dm}^{-3}0.05 mol dm−3 KNO3\text{KNO}_3KNO3​

Markscheme

Acids and bases (A-level only) Questions

  1. A Level
  2. /Chemistry
  3. /Acids and bases (A-level only)

77 exam-style questions on AQA A Level Chemistry Acids and bases (A-level only), covering Brønsted–Lowry acid–base equilibria in aqueous solution (A-level only), Definition and determination of pH (A-level only), The ionic product of water, $K_w$ (A-level only), Weak acids and bases $K_a$ for weak acids (A-level only), pH curves, titrations and indicators (A-level only), and Buffer action (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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