A technician checks the concentration of a sodium hydroxide solution by titration. A pipette is used to put 25.0 cm3 of the sodium hydroxide solution into a conical flask. The solution is titrated with 0.0500 mol/dm3 sulfuric acid.
H2SO4+2NaOH→Na2SO4+2H2O\text{H}_2\text{SO}_4 + 2\text{NaOH} \rightarrow \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O}H2SO4+2NaOH→Na2SO4+2H2O
The relative formula mass (MrM_rMr) of NaOH\text{NaOH}NaOH is 40.
The table shows the technician's burette readings.
| Titration | Initial burette reading in cm3\text{cm}^3cm3 | Final burette reading in cm3\text{cm}^3cm3 |
|---|---|---|
| Rough | 0.00 | 20.80 |
| 1 | 0.40 | 20.40 |
| 2 | 0.15 | 20.50 |
| 3 | 1.25 | 21.25 |
Calculate the concentration of the sodium hydroxide solution in g/dm3\text{g/dm}^3g/dm3.
Use only the concordant titres.
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.