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 strontium carbonate precipitate from the liquid portion of the mixture.
Step 2
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 remaining sodium nitrate solution or impurities. Tap water is not pure and may contain dissolved solids, which could contaminate the sample.
Step 3
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 ensure that any remaining moisture evaporated, helping to obtain a pure, dry sample.
