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This question is about sulfuric acid (H₂SO₄) and ethene - AQA - GCSE Chemistry - Question 4 - 2017 - Paper 1
Question 4
This question is about sulfuric acid (H₂SO₄) and ethene. Sulfuric acid is used to produce copper sulfate (CuSO₄). The equation for the reaction is: CuO(s) + H₂SO₄... show full transcript
Worked Solution & Example Answer:This question is about sulfuric acid (H₂SO₄) and ethene - AQA - GCSE Chemistry - Question 4 - 2017 - Paper 1
Step 1
Describe a method for making copper sulfate crystals from copper oxide and sulfuric acid.
Answer
To make copper sulfate crystals, follow these steps:
- Add excess copper oxide to dilute sulfuric acid to ensure complete reaction.
- Stir the mixture to allow the copper oxide to fully react with the sulfuric acid.
- Filter the solution to remove any unreacted copper oxide.
- Heat the filtered solution gently to evaporate water until crystals start to form. Be careful not to let the solution dry out completely, as this could result in the loss of the product.
Step 2
Calculate the mass of copper oxide required to produce 24.95 g of copper sulfate crystals (CuSO₄·5H₂O).
Answer
Using the formula mass of copper sulfate crystals (Mₓ):
- The molar mass of CuO is 79.5 g/mol (Cu = 63.5, O = 16).
- Calculate moles of CuSO₄·5H₂O:
- From the reaction, 1 mole of CuO produces 1 mole of CuSO₄·5H₂O. Therefore, 0.1 moles of CuSO₄·5H₂O requires 0.1 moles of CuO.
- Calculate mass of CuO needed:
Step 3
How does the wealth of countries relate to their production of ethene and sulfuric acid?
Answer
As wealth decreases, ethene production tends to decrease, as observed in countries A, B, and E. However, there are exceptions, such as country C, which has low wealth but high ethene production. Sulfuric acid production does not correlate with wealth levels.
Step 4