A student uses sodium hydroxide solution to determine the concentration of nitric acid.
The student titrates 25.0 cm3 of 0.150 mol/dm3 sodium hydroxide solution with the nitric acid.
NaOH+HNO3→NaNO3+H2O\text{NaOH} + \text{HNO}_3 \rightarrow \text{NaNO}_3 + \text{H}_2\text{O}NaOH+HNO3→NaNO3+H2O
The student's results are shown in the table.
| Titration | Initial burette reading in cm3\text{cm}^3cm3 | Final burette reading in cm3\text{cm}^3cm3 |
|---|---|---|
| Rough | 0.20 | 24.80 |
| 1 | 0.10 | 23.90 |
| 2 | 1.25 | 25.05 |
| 3 | 0.30 | 24.50 |
The relative formula mass, MrM_rMr, of nitric acid is 63.
Calculate the concentration of the nitric acid in g/dm3\text{g/dm}^3g/dm3.
Use only the concordant titres.
Give your answer to 3 significant figures.
88 exam-style questions on AQA GCSE Chemistry 4.2 Reactions of acids, covering 4.2.1a Reactions of acids with metals, 4.2.1b Redox in acid-metal reactions, 4.2.2 Neutralisation of acids and salt production, 4.2.3 Soluble salts, 4.2.4 The pH scale and neutralisation, 4.2.5a Titrations, 4.2.5b Calculating quantities in titrations, and 4.2.6 Strong and weak acids. Each one has a worked solution and a mark scheme showing where the marks go.