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3.2 Methods of separating and purifying substances

3.2 Methods of separating and purifying substances

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Question 4
H

A mixture contains sand, ethanol (boiling point 78 ∘C78\,^\circ\mathrm{C}78∘C), water (boiling point 100 ∘C100\,^\circ\mathrm{C}100∘C) and dissolved sodium chloride. Which method gives separate samples of sand, ethanol and sodium chloride?

[1]
A

Filter; fractionally distil the filtrate; crystallise the salt from the liquid left in the flask

B

Filter; simply distil the filtrate to collect ethanol; crystallise the salt from the liquid left

C

Filter; crystallise the salt from the filtrate; fractionally distil the liquid that remains

D

Fractionally distil the whole mixture; then filter the distillate to obtain the sand and salt

Markscheme

3.2 Methods of separating and purifying substances Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Methods of separating and purifying substances

107 exam-style questions on Edexcel GCSE Chemistry 3.2 Methods of separating and purifying substances, covering 3.2.1 Pure substances and mixtures, 3.2.2 Techniques for separating mixtures, 3.2.3 Paper chromatography and Rf values, and 3.2.4 Making water potable. Each one has a worked solution and a mark scheme showing where the marks go.

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