Skip to content

Course home

Question bank·5.1 Monitoring chemical reactions
Sign up

5.1 Monitoring chemical reactions

EasyMediumHard
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667
Question 8

A technician uses a potassium carbonate solution of known concentration to find the concentration of a sample of hydrochloric acid. A 25.0 cm325.0\,\mathrm{cm^{3}}25.0cm3 portion of 0.0800 mol/dm30.0800\,\mathrm{mol/dm^{3}}0.0800mol/dm3 potassium carbonate solution reacts completely with 20.00 cm320.00\,\mathrm{cm^{3}}20.00cm3 of the hydrochloric acid.

K2CO3+2HCl→2KCl+H2O+CO2 \mathrm{K_{2}CO_{3} + 2HCl \rightarrow 2KCl + H_{2}O + CO_{2}} K2​CO3​+2HCl→2KCl+H2​O+CO2​

Relative atomic mass (ArA_rAr​): H = 1.0, Cl = 35.5

What is the concentration of the hydrochloric acid in g/dm3\mathrm{g/dm^{3}}g/dm3?

[1]
A

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

B

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

C

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

D

14.6 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.

More questions