In the preparation of pure, dry crystals of copper(II) sulfate, a student adds excess copper(II) oxide powder to warm dilute sulfuric acid. The resulting mixture is then passed through a funnel containing filter paper.
State the reason why filtration is performed at this stage of the purification process.
107 exam-style questions on Edexcel GCSE Chemistry 3.2 Methods of separating and purifying substances, covering 3.2.1 Pure substances and mixtures, 3.2.2 Techniques for separating mixtures, 3.2.3 Paper chromatography and Rf values, and 3.2.4 Making water potable. Each one has a worked solution and a mark scheme showing where the marks go.