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10.1 Using the Earth's resources and obtaining potable water

10.1 Using the Earth's resources and obtaining potable water

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Question 4

Seawater and river water are treated to make them potable (safe to drink).

Seawater treatment details:

  • Concentration of ions before Process 1: Na+:0.6 mol/dm3\text{Na}^+ : 0.6\text{ mol/dm}^3Na+:0.6 mol/dm3 and Cl−:0.6 mol/dm3\text{Cl}^- : 0.6\text{ mol/dm}^3Cl−:0.6 mol/dm3
  • Process 1: Distillation
  • Concentration of ions after Process 1: YYY
  • Process 2: Chlorination

River water treatment details:

  • Concentration of ions before Process 1: Na+:0.002 mol/dm3\text{Na}^+ : 0.002\text{ mol/dm}^3Na+:0.002 mol/dm3 and Cl−:0.002 mol/dm3\text{Cl}^- : 0.002\text{ mol/dm}^3Cl−:0.002 mol/dm3
  • Process 1: Sand filtration
  • Concentration of ions after Process 1: Na+:0.002 mol/dm3\text{Na}^+ : 0.002\text{ mol/dm}^3Na+:0.002 mol/dm3 and Cl−:0.002 mol/dm3\text{Cl}^- : 0.002\text{ mol/dm}^3Cl−:0.002 mol/dm3
  • Process 2: Expose to ultraviolet light

Seawater is desalinated during Process 1 (Distillation). Which pair of concentrations could represent YYY?

A

Na+:0.000 mol/dm3\text{Na}^+ : 0.000\text{ mol/dm}^3Na+:0.000 mol/dm3, Cl−:0.000 mol/dm3\text{Cl}^- : 0.000\text{ mol/dm}^3Cl−:0.000 mol/dm3

B

Na+:0.000 mol/dm3\text{Na}^+ : 0.000\text{ mol/dm}^3Na+:0.000 mol/dm3, Cl−:0.6 mol/dm3\text{Cl}^- : 0.6\text{ mol/dm}^3Cl−:0.6 mol/dm3

C

Na+:0.6 mol/dm3\text{Na}^+ : 0.6\text{ mol/dm}^3Na+:0.6 mol/dm3, Cl−:0.000 mol/dm3\text{Cl}^- : 0.000\text{ mol/dm}^3Cl−:0.000 mol/dm3

D

Na+:0.6 mol/dm3\text{Na}^+ : 0.6\text{ mol/dm}^3Na+:0.6 mol/dm3, Cl−:0.6 mol/dm3\text{Cl}^- : 0.6\text{ mol/dm}^3Cl−:0.6 mol/dm3

Markscheme

10.1 Using the Earth's resources and obtaining potable water Questions

  1. GCSE
  2. /Chemistry
  3. /10.1 Using the Earth's resources and obtaining potable water

11 exam-style questions on AQA GCSE Chemistry 10.1 Using the Earth's resources and obtaining potable water, covering 10.1.1 Using the Earth's resources and sustainable development, 10.1.2 Potable water, 10.1.3 Waste water treatment, and 10.1.4 Alternative methods of extracting metals (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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