The volume of dilute hydrochloric acid required to neutralise 25.0 cm3 of sodium hydroxide solution can be found by titration.
In the titration, a few drops of phenolphthalein indicator were added to the sodium hydroxide solution in a conical flask before adding the dilute hydrochloric acid from a burette.
State the colour change of the phenolphthalein indicator at the end point of the titration when the sodium hydroxide solution has just been neutralised.
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.