A student uses a titration to find the volume of dilute hydrochloric acid needed to neutralise 25.0 cm3\mathrm{cm^{3}}cm3 of sodium hydroxide solution.
The acid is in the burette. The alkali is measured with a pipette.
Which mistake would make the student's titre larger than it should be?
Rinsing the conical flask with distilled water before adding the alkali
Rinsing the burette with distilled water, but not with the acid, before filling it with the acid
Rinsing the pipette with distilled water, but not with the alkali, before measuring the alkali
Reading the top of the meniscus, instead of the bottom, at both the start and the end
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.