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Practical Guide
Chemistry
Preparation of a salt
This document contains:
Links to YouTube clips showing the practical procedure
Information from examination boards AQA, OCR, Edexcel
Potential examination questions and answers
This resource is strictly for the use of member schools for as long as they remain members of The PiXL Club. It may not be copied, sold nor transferred to a third party or used by the school after membership ceases. Until such time it may be freely used within the member school.
All opinions and contributions are those of the authors. The contents of this resource are not connected with nor endorsed by any other company, organisation or institution.
Commissioned by The PiXL Club Ltd. November 2016
The PiXL Club Ltd, Company number
© Copyright The PiXL Club Ltd, 2016

2. Required practical – exam boards
AQA

3. Practical procedure: Preparation of a Salt
Video 1
Video 2
Click on each of the tabs to take you to a YouTube clip. Please note these are external sites to PiXL, PiXL does not control the content of these sites.
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4. Possible examination style questions
A student wanted to make a pure, dry sample of magnesium sulphate by using an acid and magnesium carbonate.
Name the processes involved in the preparation.
Name the two chemicals required to make magnesium sulphate.
Describe the method needed by the student.
Write a word equation for the reaction.
Explain how the purity of the salt could be determined.

5. Possible examination style questions answers
Name the processes involved.
ANS:
Neutralisation
Evaporation
Crystallisation

6. Possible examination style questions answers
Name the two chemicals required to make magnesium chloride.
ANS:
Magnesium carbonate
Sulfuric acid

7. Possible examination style questions answers
Describe the method needed by the student.
ANS:
Gently warm the acid using Bunsen burner (or alternative)
Add excess magnesium carbonate to warmed acid
Filter solution to remove unreacted base
Wash with distilled water
Evaporate water / crystallisation

8. Possible examination style questions answers
Write a word equation for the reaction.
ANS: Magnesium Carbonate + Sulfuric acid Magnesium sulfate + water

9. Possible examination style questions answers
Explain how the purity of the salt could be determined.
ANS:
Find the melting point

10. Key questions:
What safety precautions should you take when carrying out this experiment and why?
Why was it necessary to warm the sulfuric acid?
What colour was the copper sulfate solution that formed?
Why was it necessary to add copper oxide until it was present in excess?
How did you know when the copper oxide was present in excess?
How did you separate the excess copper oxide from the copper sulfate solution?

11. Key questions: What is meant by the filtrate?
What is meant by the residue?
What is the filtrate in this experiment?
What is the residue in this experiment?
Why is a water bath used to evaporate the water from the copper sulphate solution instead of heating the evaporating basin directly with a Bunsen burner?
Why should you not evaporate all of the water from the copper sulphate solution?

12. Summary document
A summary document is also available on Huddle which contains all the relevant information about this practical from the different examination boards. This document includes practical methods and other potential examination questions