A student carries out a titration to determine the concentration of a sample of hydrochloric acid using a standard solution of sodium hydroxide. The experimental burette readings obtained during the titration runs are shown in the table below.
| Titration run | Rough | Trial 1 | Trial 2 | Trial 3 |
|---|---|---|---|---|
| Final burette reading (cm3\text{cm}^3cm3) | 24.80 | 23.15 | 23.95 | 24.50 |
| Initial burette reading (cm3\text{cm}^3cm3) | 1.50 | 0.40 | 1.10 | 1.30 |
Using only concordant results, what is the calculated mean volume of sodium hydroxide solution added?
22.93 cm322.93\text{ cm}^322.93 cm3
23.55 cm323.55\text{ cm}^323.55 cm3
22.80 cm322.80\text{ cm}^322.80 cm3
23.03 cm323.03\text{ cm}^323.03 cm3
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.