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5.1 Monitoring chemical reactions

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Question 17
H

In a titration, 25.0 cm3\mathrm{cm^{3}}cm3 of potassium hydroxide solution is exactly neutralised by 22.50 cm3\mathrm{cm^{3}}cm3 of 0.100 mol/dm3\mathrm{mol/dm^{3}}mol/dm3 sulfuric acid.

2KOH+H2SO4→K2SO4+2H2O \mathrm{2KOH + H_{2}SO_{4} \rightarrow K_{2}SO_{4} + 2H_{2}O} 2KOH+H2​SO4​→K2​SO4​+2H2​O

Relative atomic mass (ArA_rAr​): H = 1.0 O = 16.0 K = 39.1

What is the concentration of the potassium hydroxide solution in g/dm3\mathrm{g/dm^{3}}g/dm3?

[1]
A

0.180 g/dm3\mathrm{g/dm^{3}}g/dm3

B

2.52 g/dm3\mathrm{g/dm^{3}}g/dm3

C

5.05 g/dm3\mathrm{g/dm^{3}}g/dm3

D

10.1 g/dm3\mathrm{g/dm^{3}}g/dm3

Markscheme

5.1 Monitoring chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /5.1 Monitoring chemical reactions

57 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.

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