A student repeated an experiment five times to measure the mass of dry silver chloride precipitate obtained from a gravimetric analysis of a chloride-containing salt solution.
The table below shows the results of the five trials:
| Trial | Mass of precipitate obtained (g\text{g}g) |
|---|---|
| 1 | 1.44 |
| 2 | 1.48 |
| 3 | 1.38 |
| 4 | 1.46 |
| 5 | 1.44 |
Calculate the mean mass of precipitate obtained and its associated uncertainty.
State your final answer in the form: mean±uncertainty\text{mean} \pm \text{uncertainty}mean±uncertainty.
53 exam-style questions on AQA GCSE Chemistry 3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, covering 3.1.1 Conservation of mass and balanced chemical equations, 3.1.2 Relative formula mass, 3.1.3 Mass changes when a reactant or product is a gas, and 3.1.4 Chemical measurements. Each one has a worked solution and a mark scheme showing where the marks go.