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2.1 Purity and separating mixtures

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Question 11

A workshop recovers substances from a used cleaning fluid. The fluid contains ethanol and water. Iron filings have entered the fluid during use.

The table shows some properties of the substances.

SubstanceRelevant properties
iron filingssolid and insoluble in the liquid mixture
ethanolmixes completely with water; boiling point 78 ∘C78\,^\circ\mathrm{C}78∘C
watermixes completely with ethanol; boiling point 100 ∘C100\,^\circ\mathrm{C}100∘C

A technician proposes this method:

  1. Filter the used cleaning fluid.
  2. Separate the filtrate using simple distillation.
  3. Collect all the condensed liquid in one flask and label it as pure water.

Evaluate the technician's method. Explain how the method should be changed to obtain separate samples of ethanol and water with the highest possible purity.

[5]
Markscheme

2.1 Purity and separating mixtures Questions

  1. GCSE
  2. /Chemistry
  3. /2.1 Purity and separating mixtures

102 exam-style questions on OCR GCSE Chemistry 2.1 Purity and separating mixtures, covering 2.1.1 Pure substances and melting point data, 2.1.2 Relative formula mass and empirical formula, 2.1.3 Formulations as useful mixtures, 2.1.4 Techniques for separating mixtures, and 2.1.5 Chromatography and Rf values. Each one has a worked solution and a mark scheme showing where the marks go.

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