In a student's investigation, magnesium hydroxide powder is added in 0.15 g portions to 30 cm3 of dilute hydrochloric acid until the magnesium hydroxide is in excess.
Universal indicator solution is used to determine the pH of the mixture after each portion of magnesium hydroxide is added by comparing the colour to a standard pH colour chart.
State the name of an alternative piece of equipment that can be used to measure the pH of the mixture more accurately.
276 exam-style questions on Edexcel GCSE Chemistry 4.1 Acids, covering 4.1.1 Acids, alkalis and the pH scale, 4.1.2 Hydrogen ion concentration and pH, 4.1.3 Dilute and concentrated, weak and strong acids, 4.1.4 Bases, alkalis and the reactions of acids, 4.1.5 Chemical tests for hydrogen and carbon dioxide, 4.1.6 Neutralisation as a reaction of acids with bases, 4.1.7 Preparing soluble salts, and 4.1.8 Solubility rules and preparing insoluble salts. Each one has a worked solution and a mark scheme showing where the marks go.