A beaker contains 80.0 cm380.0\,\mathrm{cm^{3}}80.0cm3 of sodium chloride solution with a concentration of 25.0 g/dm325.0\,\mathrm{g/dm^{3}}25.0g/dm3.
Some water evaporates until the total volume of the solution is 50.0 cm350.0\,\mathrm{cm^{3}}50.0cm3. Distilled water is then added until the concentration is 16.0 g/dm316.0\,\mathrm{g/dm^{3}}16.0g/dm3.
Calculate the volume of distilled water added.
152 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.