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5.1 Monitoring chemical reactions

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Question 20
H

A student dissolves 2.65 g of sodium carbonate in water and makes the solution up to 250 cm3\mathrm{cm^{3}}cm3.

The student then takes 25.0 cm3\mathrm{cm^{3}}cm3 of this solution and adds water until the total volume is 100 cm3\mathrm{cm^{3}}cm3.

Relative formula mass (MrM_rMr​): Na2CO3\mathrm{Na_{2}CO_{3}}Na2​CO3​ = 106.0

What is the concentration of the diluted solution?

[1]
A

0.00250 mol/dm3\mathrm{mol/dm^{3}}mol/dm3

B

0.0250 mol/dm3\mathrm{mol/dm^{3}}mol/dm3

C

0.100 mol/dm3\mathrm{mol/dm^{3}}mol/dm3

D

0.400 mol/dm3\mathrm{mol/dm^{3}}mol/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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