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6 marksThe Atmosphere

CAPE Chemistry Unit 2 · 2005 · Paper 2 · Question 8(b)(ii)

Use of CaCO3 scrubbers to capture SO2 emissions.

Calculate the mass of CaCO3, in kg, needed in a slurry to extract the SO2 present in 10 m3 of industrial waste gases at r.t.p., if SO2 comprises 10% of this volume.

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Other parts of this question

  1. 8(a)(i)Describe the Contact Process for the manufacture of sulphuric acid, including the raw material sources and the chemistry of the process.[8 marks]
  2. 8(a)(ii)Explain how sulphur dioxide (SO2) modifies the atmosphere.[2 marks]
  3. 8(b)(i)Write an equation for the reaction between CaCO3 and SO2, and explain the underlying principle of the action of the carbonate scrubber.[4 marks]

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