A student makes a soluble salt by reacting an insoluble metal hydroxide with dilute sulfuric acid.
The student does four experiments. The same volume and concentration of acid are used in each experiment.
After stirring until no further change occurs, the student measures the mass of unreacted solid.
| Experiment | Mass of metal hydroxide added in g | Mass of unreacted solid in g |
|---|---|---|
| A | 1.20 | 0.00 |
| B | 1.60 | 0.00 |
| C | 2.00 | 0.20 |
| D | 2.40 | 0.60 |
The mixture will be filtered after the reaction.
Which experiment should be used to obtain a pure salt solution while wasting the smallest mass of metal hydroxide?
Explain your answer.
88 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.