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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 3
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A municipal water treatment facility processes brackish groundwater and surface runoff to produce potable water.

Brackish groundwater treatment:

  • Concentration of ions before Process 1: Ca2+:0.05 mol/dm3\text{Ca}^{2+} : 0.05\text{ mol/dm}^3Ca2+:0.05 mol/dm3 and SO42−:0.05 mol/dm3\text{SO}_4^{2-} : 0.05\text{ mol/dm}^3SO42−​:0.05 mol/dm3
  • Process 1: Desalination via reverse osmosis
  • Concentration of ions after Process 1: ZZZ
  • Process 2: Chlorination

Surface runoff treatment:

  • Concentration of ions before Process 1: Ca2+:0.002 mol/dm3\text{Ca}^{2+} : 0.002\text{ mol/dm}^3Ca2+:0.002 mol/dm3 and SO42−:0.002 mol/dm3\text{SO}_4^{2-} : 0.002\text{ mol/dm}^3SO42−​:0.002 mol/dm3
  • Process 1: Coarse sand filtration
  • Concentration of ions after Process 1: Ca2+:0.002 mol/dm3\text{Ca}^{2+} : 0.002\text{ mol/dm}^3Ca2+:0.002 mol/dm3 and SO42−:0.002 mol/dm3\text{SO}_4^{2-} : 0.002\text{ mol/dm}^3SO42−​:0.002 mol/dm3
  • Process 2: Sterilisation using ultraviolet (UV) irradiation

Which pair of concentrations represents the ion concentrations Z Z\,Z after the brackish groundwater undergoes reverse osmosis?

A

Ca2+:0.05 mol/dm3\text{Ca}^{2+} : 0.05\text{ mol/dm}^3Ca2+:0.05 mol/dm3 and SO42−:0.05 mol/dm3\text{SO}_4^{2-} : 0.05\text{ mol/dm}^3SO42−​:0.05 mol/dm3

B

Ca2+:0.05 mol/dm3\text{Ca}^{2+} : 0.05\text{ mol/dm}^3Ca2+:0.05 mol/dm3 and SO42−:0.00 mol/dm3\text{SO}_4^{2-} : 0.00\text{ mol/dm}^3SO42−​:0.00 mol/dm3

C

Ca2+:0.00 mol/dm3\text{Ca}^{2+} : 0.00\text{ mol/dm}^3Ca2+:0.00 mol/dm3 and SO42−:0.05 mol/dm3\text{SO}_4^{2-} : 0.05\text{ mol/dm}^3SO42−​:0.05 mol/dm3

D

Ca2+:0.00 mol/dm3\text{Ca}^{2+} : 0.00\text{ mol/dm}^3Ca2+:0.00 mol/dm3 and SO42−:0.00 mol/dm3\text{SO}_4^{2-} : 0.00\text{ mol/dm}^3SO42−​:0.00 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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