A student titrated 20.0 cm320.0\text{ cm}^320.0 cm3 portions of dilute sulfuric acid with a 0.150 mol/dm30.150\text{ mol/dm}^30.150 mol/dm3 potassium hydroxide solution.
The student's results are shown below:
| Titration | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| Volume of potassium hydroxide solution (in cm3\text{cm}^3cm3) | 19.50 | 18.10 | 18.60 | 18.55 | 18.65 |
The equation for the reaction is:
2KOH+H2SO4→K2SO4+2H2O 2\text{KOH} + \text{H}_2\text{SO}_4 \rightarrow \text{K}_2\text{SO}_4 + 2\text{H}_2\text{O} 2KOH+H2SO4→K2SO4+2H2OCalculate the concentration of the sulfuric acid in mol/dm3\text{mol/dm}^3mol/dm3.
Use only the student's concordant results. Concordant results are those within 0.10 cm30.10\text{ cm}^30.10 cm3 of each other.
40 exam-style questions on AQA GCSE Chemistry 4.2 Reactions of acids, covering 4.2.1 Reactions of acids with metals, 4.2.2 Neutralisation of acids and salt production, 4.2.3 Soluble salts, 4.2.4 The pH scale and neutralisation, 4.2.5 Titrations, and 4.2.6 Strong and weak acids (HT only). Each one has a worked solution and a mark scheme showing where the marks go.