A student does a titration. The table shows the student's results.
| Titration | Rough | 1 | 2 | 3 | 4 |
|---|---|---|---|---|---|
| Titre (cm3\mathrm{cm^{3}}cm3) | 25.40 | 24.70 | 24.25 | 24.30 | 24.20 |
Which mean titre should the student use to calculate the concentration of the solution?
24.25 cm3\mathrm{cm^{3}}cm3
24.36 cm3\mathrm{cm^{3}}cm3
24.42 cm3\mathrm{cm^{3}}cm3
24.57 cm3\mathrm{cm^{3}}cm3
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.