A student investigated the change in pH when sodium hydroxide solution is added to 30 cm3 of dilute hydrochloric acid.
They plotted their results on a graph, represented by the data in the table below.
Figure 1
| Volume of sodium hydroxide added (cm3\text{cm}^3cm3) | pH |
|---|---|
| 0.0 | 1.5 |
| 5.0 | 1.6 |
| 10.0 | 1.8 |
| 15.0 | 2.2 |
| 20.0 | 7.0 |
| 25.0 | 11.8 |
| 30.0 | 12.5 |
Using Figure 1, determine the pH of the hydrochloric acid at the start of the experiment.
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.