The photo shows copper(II) sulphate prepared by one group of students in my chemistry class.
Copper(II) sulphate can be prepared by using one of the reactions
- sulphuric acid and copper(II) oxide
- sulphuric acid and copper(II) carbonate
- H2SO4 + CuO --> CuSO4 + H2O
- H2SO4 + CuCO3 --> CuSO4 + H2O
In SPM 2003, students are required to describe a laboratory experiment to prepare dry magnesium chloride based on given materials :
- magnesium sulphate solutions,
- dilute hydrochloric acid,
- potassium carbonate solution
This question is a bit tricky. Students need to consider few things before write their plan:
- Is magnesium chloride a soluble salt?
- What are reactants used to prepare magnesium chloride?
- Are the reactants required given in the list?
- How to make use of the given materials?(Hint: precipitation reaction)
- Explain the procedure in details.