The pH of a solution can be measured using universal indicator or using a pH probe.
Why does a pH probe give a better measurement of the pH?
the probe gives a more precise value of the pH
the probe works over a wider range of pH values
the probe does not need to be washed between tests
the probe changes colour to match the pH
40 exam-style questions on AQA GCSE Chemistry 4.2 Reactions of acids, covering 4.2.1a Reactions of acids with metals, 4.2.1b Redox in acid-metal reactions, 4.2.2 Neutralisation of acids and salt production, 4.2.3 Soluble salts, 4.2.4 The pH scale and neutralisation, 4.2.5a Titrations, 4.2.5b Calculating quantities in titrations, and 4.2.6 Strong and weak acids. Each one has a worked solution and a mark scheme showing where the marks go.