A student investigated the rate of the reaction of sodium thiosulfate solution with dilute hydrochloric acid using the disappearing cross experiment.
During the method, the student:
Explain why a 50 cm350\text{ cm}^350 cm3 conical flask is unsuitable to use in this method.
Identify the independent variable and the dependent variable in this investigation.
The table below shows the results of the experiment:
| Concentration of sodium thiosulfate (g/dm3\text{g/dm}^3g/dm3) | Time taken for cross to disappear (seconds) |
|---|---|
| 6 | 150 |
| 12 | 75 |
| 18 | 50 |
| 24 | 38 |
Which concentration of sodium thiosulfate solution has the highest rate of reaction? Explain how the data shows this.
26 exam-style questions on AQA GCSE Chemistry 6.1 Rate of reaction, covering 6.1.1 Calculating rates of reactions, 6.1.2 Factors which affect the rates of chemical reactions, 6.1.3 Collision theory and activation energy, and 6.1.4 Catalysts. Each one has a worked solution and a mark scheme showing where the marks go.