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 c... 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
(i) Suggest why the student filtered the mixture.
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Answer
The student filtered the mixture to remove the solid or precipitate formed during the reaction.
Step 2
(ii) Explain why the student washed the solid with deionised water rather than tap water.
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Answer
The student washed the solid with deionised water to remove any sodium nitrate solution or impurities. Tap water is not pure; it contains dissolved solids that could contaminate the strontium carbonate.
Step 3
(iii) Suggest why the student put the strontium carbonate in a warm place.
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The student put the strontium carbonate in a warm place to facilitate the drying process, ensuring that any remaining moisture evaporates.
