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Acids and bases (A-level only)

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Question 14

Which change causes the pH of 2.0 cm3 of 1.0×10−1 mol dm−3 HNO31.0 \times 10^{-1}\text{ mol dm}^{-3}\text{ HNO}_31.0×10−1 mol dm−3 HNO3​ to be tripled at 298 K? (Take Kw=1.0×10−14 mol2 dm−6K_\text{w} = 1.0 \times 10^{-14}\text{ mol}^2\text{ dm}^{-6}Kw​=1.0×10−14 mol2 dm−6 at 298 K)

A

adding 18 cm318\text{ cm}^318 cm3 of water

B

adding 198 cm3198\text{ cm}^3198 cm3 of water

C

adding 1998 cm31998\text{ cm}^31998 cm3 of water

D

adding 2.0 cm32.0\text{ cm}^32.0 cm3 of 1.0×10−1 mol dm−3 NaOH1.0 \times 10^{-1}\text{ mol dm}^{-3}\text{ NaOH}1.0×10−1 mol dm−3 NaOH

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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