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5.1 Monitoring chemical reactions

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Question 12

During a quality check, a sodium chloride solution is prepared for analysis. The technician records the following information.

QuantityValue
Volume of solution used before dilution40.0 cm3\mathrm{cm^{3}}cm3
Total volume after water is added160 cm3\mathrm{cm^{3}}cm3
Concentration after dilution12.0 g/dm3\mathrm{g/dm^{3}}g/dm3

What was the concentration of the original solution?

[1]
A

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

B

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

C

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

D

3.00 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

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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