Chemistry 5070 · O Level · Separation and purification
Separation and purification — practice question
Q consists of solid copper(II) carbonate mixed with solid lead sulfate.
Lead sulfate does not dissolve in water and shows no reaction with dilute sulfuric acid.
Copper(II) carbonate is insoluble in water. When it reacts with dilute sulfuric acid, copper(II) sulfate solution is produced.
(main)[6]
Plan an investigation to obtain pure copper(II) sulfate crystals and pure lead sulfate solid from Q.
Your plan should explain how to use common laboratory apparatus, dilute sulfuric acid and Q. No other chemicals should be used.
Your plan should include:
• the apparatus needed
• the preparation of copper(II) sulfate solution
• the method to obtain pure copper(II) sulfate crystals
• the method to obtain pure lead sulfate solid
• how to test that the lead sulfate is pure
You may draw a diagram to help answer the question.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “M1 filter funnel AND paper AND suitable container (for example conical flask / beaker)” …