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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 33

Table 1 shows the results of a chemical analysis on a sample of bottled mineral water used for drinking.

Table 1: Concentration of dissolved ions in the mineral water sample

Dissolved ionConcentration in mg dm−3\text{mg dm}^{-3}mg dm−3
Sodium (Na+{\text{Na}}^+Na+)14.50
Calcium (Ca2+{\text{Ca}}^{2+}Ca2+)38.20
Potassium (K+{\text{K}}^+K+)1.80
Chloride (Cl−{\text{Cl}}^-Cl−)21.30
Hydrogencarbonate (HCO3−{\text{HCO}}_3^-HCO3−​)145.00
Sulfate (SO42−{{\text{SO}}_4}^{2-}SO4​2−)12.10

Using information from Table 1, explain why this bottled mineral water is not chemically pure water.

[2]
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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