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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 8

An environmental chemist analyses treated wastewater from a pharmaceutical synthesis facility. The fluid has been filtered and is completely clear and colourless. The analysis of the water is shown in the table below:

SubstanceConcentration in mg/dm³
Ammonium ions (NH4+NH_4^+NH4+​)12
Phosphate ions (PO43−PO_4^{3-}PO43−​)8
Methanol (CH3OHCH_3OHCH3​OH)2
pH6.8

Explain why this treated water sample should be classified as a mixture rather than a chemically pure substance.

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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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