Hydrated copper sulfate, CuSO₄·5H₂O, is a blue solid - Edexcel - GCSE Chemistry - Question 6 - 2019 - Paper 1
Question 6
Hydrated copper sulfate, CuSO₄·5H₂O, is a blue solid.
Anhydrous copper sulfate, CuSO₄, is a white solid.
Heat energy is needed to convert hydrated copper sulfate to... show full transcript
Worked Solution & Example Answer:Hydrated copper sulfate, CuSO₄·5H₂O, is a blue solid - Edexcel - GCSE Chemistry - Question 6 - 2019 - Paper 1
Step 1
Description of the Experiment
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Answer
To demonstrate the reversible reaction between hydrated copper sulfate and anhydrous copper sulfate, heat a sample of hydrated copper sulfate (CuSO₄·5H₂O) in a dry test tube. As the hydrate is heated, it will lose water molecules and change color from blue to white, indicating the formation of anhydrous copper sulfate (CuSO₄). During this process, the release of water vapor can be observed.
Step 2
Observations and Reverse Reaction
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Answer
After heating, allow the anhydrous copper sulfate to cool. Introduce a few drops of water to the solid. The white solid will rehydrate and turn back to blue, demonstrating that the reaction can proceed in the reverse direction.
