A laboratory technician prepares a stock solution of copper(II) sulfate by dissolving 4.25 g of the anhydrous salt in enough deionised water to make a 125 cm3 solution.
Calculate the concentration of this copper(II) sulfate solution in g dm−3\text{g~dm}^{-3}g dm−3.
concentration (g dm−3)=mass of solute (g)volume of solution (dm3) \text{concentration (g~dm}^{-3}\text{)} = \frac{\text{mass of solute (g)}}{\text{volume of solution (dm}^3\text{)}} concentration (g dm−3)=volume of solution (dm3)mass of solute (g)258 exam-style questions on Edexcel GCSE Chemistry Calculations involving masses. Each one has a worked solution and a mark scheme showing where the marks go.