An analytical chemist is determining the total acidity of a batch of white wine (primarily tartaric acid) by titrating a sample against a standardised solution of sodium hydroxide. The chemist decides against using universal indicator to identify the equivalence point of this titration.
Explain why universal indicator is unsuitable for determining the precise endpoint of this titration.
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.