A student investigated how the pH of a dilute hydrochloric acid solution changes as calcium oxide powder is added.
Table 1 shows the results of the investigation.
Table 1
| Mass of calcium oxide added in g | pH of mixture |
|---|---|
| 0.00 | 1.2 |
| 0.05 | 1.2 |
| 0.10 | 1.3 |
| 0.15 | 1.5 |
| 0.20 | 2.1 |
| 0.25 | 7.0 |
| 0.30 | 11.9 |
| 0.35 | 12.6 |
| 0.40 | 12.7 |
On the grid below:
- Add suitable scales to both the vertical and horizontal axes.
- Plot a graph of the pH of the mixture against the mass of calcium oxide added.
- Draw a line of best fit through the points.
Acids Questions
Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 100 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.