This question is about salts - AQA - GCSE Chemistry Combined Science - Question 1 - 2022 - Paper 1
Question 1
This question is about salts.
Green copper carbonate and sulfuric acid can be used to produce blue copper sulfate crystals.
Excess copper carbonate is added to sul... show full transcript
Worked Solution & Example Answer:This question is about salts - AQA - GCSE Chemistry Combined Science - Question 1 - 2022 - Paper 1
Step 1
Excess copper carbonate observations
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Answer
The solution turns blue, indicating the formation of copper sulfate.
Bubbles of gas (carbon dioxide) are observed, showing that a reaction is occurring.
The green solid (copper carbonate) disappears, indicating it has reacted completely.
Step 2
How can the excess copper carbonate be removed?
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Answer
The excess copper carbonate can be removed by filtration.
Step 3
What is the pH of the solution at the end of the reaction?
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pH = 7
Step 4
What type of reaction is this?
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This is a neutralization reaction.
Step 5
Determine the mass of ammonium nitrate that crystallises on cooling.
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Answer
At 80 °C, the maximum solubility is 83 g per 100 cm³ of water.
At 20 °C, the maximum solubility is 32 g per 100 cm³ of water.
Therefore, the mass that crystallises is:
