(a)[3]
Describe how and explain why water may be separated from aqueous copper(II) sulfate by distillation. Include a description of distillation in your answer. You may include a labelled diagram.
(b)[1]
Copper(II) sulfate can be made by heating excess copper(II) oxide with dilute sulfuric acid. $\text{CuO(s)} + \text{H}_2\text{SO}_4\text{(aq)} \rightarrow \text{CuSO}_4\text{(aq)} + \text{H}_2\text{O(l)}$ Which method is used to remove excess copper(II) oxide from the reaction mixture?
(c)[2]
A copper compound is made up of $21.09\%$ copper, $43.82\%$ caesium and $35.09\%$ chlorine by mass. Use this data to work out the empirical formula of the copper compound.