Q3. A student plans a method to prepare pure crystals of copper sulfate.

The student's method is

1. Add one spatula of calcium carbonate to dilute hydrochloric acid in a beaker.

2. When the fizzing stops, heat the solution with a bunsen burner until all the liquid is gone.

The method contains several errors and does not produce copper sulfate crystals.

5

Explain the improvements the student should make to the method so that pure crystals of

copper sulfate are produced. (6) * S

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Mathematics

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31 October, 06:24

Q3. A student plans a method to prepare pure crystals of copper sulfate.

The student's method is

1. Add one spatula of calcium carbonate to dilute hydrochloric acid in a beaker.

2. When the fizzing stops, heat the solution with a bunsen burner until all the liquid is gone.

The method contains several errors and does not produce copper sulfate crystals.

5

Explain the improvements the student should make to the method so that pure crystals of

copper sulfate are produced. (6) * S

+2

Answers (1)

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Ty Huffman · Answer 1

1) The student didn't add copper sulfate but instead he added calcium carbonate.

2) The heated solution should be left to get bigger crystals and should not be instantly allowed to evaporate.

3) He should use copper carbonate not calcium carbonate.

4) Sulfuric acid was added instead of hydrochloric acid.

5) Add solid excessively so that all of the acid is retained.

6) Filter the solution to remove unreacted solid.

7) Heat gently, so the crystals will start to appear.