A student investigates the reaction between calcium carbonate and hydrochloric acid by measuring the loss in mass as carbon dioxide gas escapes.
The student repeats the experiment five times under identical conditions and records the mass of carbon dioxide lost after 5 minutes.
The table shows their results:
| Trial | Mass of carbon dioxide lost (g) |
|---|---|
| Trial 1 | 1.45 |
| Trial 2 | 1.38 |
| Trial 3 | 1.82 |
| Trial 4 | 1.41 |
| Trial 5 | 1.43 |
Identify the anomalous trial.
Calculate the mean mass of carbon dioxide lost. You must not include the anomalous result in your calculation. Give your answer to 3 significant figures.
8 exam-style questions on OCR GCSE Chemistry Practical skills. Each one has a worked solution and a mark scheme showing where the marks go.