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3 marksOxidation – Reduction Reactions

CSEC Chemistry · January 2005 · Paper 2 · Question 5(c)

With reference to the gas produced when hydrochloric acid reacts with sodium sulphite, account for the observed changes in the acidified potassium manganate (VII) described in (b) (i) on page 14.

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Other parts of this question

  1. 5(a)(i)Write balanced equations for the reactions between hydrochloric acid and sodium sulphite.[2 marks]
  2. 5(a)(ii)Write balanced equations for the reactions between hydrochloric acid and sodium carbonate.[2 marks]
  3. 5(a)(iii)State ONE effect that the products from these two reactions could have on the environment.[1 mark]
  4. 5(b)(i)Describe the observations expected from tests (i) – (iv) in Table 2. Observations from: (i) Acidified potassium manganate (VII) with gas from sodium sulphite.[4 marks]
  5. 5(b)(ii)Describe the observations expected from tests (i) – (iv) in Table 2. Observations from: (ii) Aqueous calcium hydroxide with gas from sodium carbonate.[4 marks]
  6. 5(b)(iii)Describe the observations expected from tests (i) – (iv) in Table 2. Observations from: (iii) Damp blue litmus with gas from sodium sulphite.[4 marks]
  7. 5(b)(iv)Describe the observations expected from tests (i) – (iv) in Table 2. Observations from: (iv) Damp blue litmus with gas from sodium carbonate.[4 marks]
  8. 5(d)Draw a diagram of the apparatus to show how the products formed from observation (b) (ii) could be separated.[3 marks]

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