A student adds acid from a burette to an alkali in a conical flask.
The diagrams show part of the burette at the start and at the end of the titration. The scale is in cm3\mathrm{cm^{3}}cm3.

What volume of acid did the student add?
21.70 cm3\mathrm{cm^{3}}cm3
22.30 cm3\mathrm{cm^{3}}cm3
22.70 cm3\mathrm{cm^{3}}cm3
26.90 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.