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5.1 Monitoring chemical reactions

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Question 28

A measured portion of sodium carbonate solution is placed in a flask. The portion has a volume of 25.0 cm3\mathrm{cm^{3}}cm3 and a concentration of 0.160 mol/dm3\mathrm{mol/dm^{3}}mol/dm3.

Na2CO3+2HCl→2NaCl+H2O+CO2 \mathrm{Na_{2}CO_{3} + 2HCl \rightarrow 2NaCl + H_{2}O + CO_{2}} Na2​CO3​+2HCl→2NaCl+H2​O+CO2​

What volume of 0.250 mol/dm3\mathrm{mol/dm^{3}}mol/dm3 hydrochloric acid is needed to react completely with the sodium carbonate?

[1]
A

16.0 cm3\mathrm{cm^{3}}cm3

B

32.0 cm3\mathrm{cm^{3}}cm3

C

50.0 cm3\mathrm{cm^{3}}cm3

D

78.1 cm3\mathrm{cm^{3}}cm3

Markscheme

5.1 Monitoring chemical reactions Questions

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

152 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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