A student was asked to prepare a pure, dry sample of strontium carbonate - Edexcel - GCSE Chemistry - Question 1 - 2018 - Paper 1
Question 1
A student was asked to prepare a pure, dry sample of strontium carbonate.
To make the strontium carbonate, the student mixed strontium nitrate solution with sodium ... show full transcript
Worked Solution & Example Answer:A student was asked to prepare a pure, dry sample of strontium carbonate - Edexcel - GCSE Chemistry - Question 1 - 2018 - Paper 1
Step 1
Suggest why the student filtered the mixture.
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Answer
The student filtered the mixture to remove the solid or precipitate, which is the strontium carbonate formed during the reaction.
Step 2
Explain why the student washed the solid with deionised water rather than tap water.
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Answer
The student used deionised water to wash the solid strontium carbonate in order to remove any sodium nitrate solution or impurities. Tap water is not suitable because it contains dissolved solids and is not pure, which could contaminate the strontium carbonate.
Step 3
Suggest why the student put the strontium carbonate in a warm place.
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Answer
The student likely put the strontium carbonate in a warm place to facilitate the drying process, allowing any remaining moisture to evaporate more quickly.
