A technician evaporates all the water from a sample of a solution so that only the dry solute remains.
| Measurement | Value |
|---|---|
| volume of solution used | 20.0 cm3 |
| mass of empty evaporating basin | 42.68 g |
| mass of evaporating basin and dry solute | 43.28 g |
Calculate the concentration of the solution in g dm−3\mathrm{g\,dm^{-3}}gdm−3.
142 exam-style questions on Edexcel GCSE Chemistry 2.6 Calculations involving masses, covering 2.6.1 Relative formula mass and percentage composition, 2.6.2 Empirical and molecular formulae, 2.6.3 Conservation of mass, 2.6.4 Reacting masses and concentration in g dm⁻³, 2.6.5 The mole and the Avogadro constant, and 2.6.6 Limiting reactants and stoichiometry. Each one has a worked solution and a mark scheme showing where the marks go.