A student investigated the rate of reaction between calcium carbonate and dilute hydrochloric acid by measuring the volume of carbon dioxide gas produced.
Their results are shown in the table below:
| Time in seconds | Volume of carbon dioxide in cm3\text{cm}^3cm3 |
|---|---|
| 0 | 0 |
| 15 | 18 |
| 30 | 31 |
| 45 | 40 |
| 60 | 46 |
| 75 | 50 |
| 90 | 52 |
| 105 | 52 |
| 120 | 52 |
State why the measurements could have been stopped at 90 seconds.
Practise Edexcel GCSE Chemistry Rates of reaction with exam-style questions for Foundation and Higher tier. 166 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
