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4 marksElectrochemistry

CSEC Chemistry · January 2016 · Paper 2 · Question 4(c)

Remi also wants to purify an impure nickel sample by electrolysis. Suggest how he could modify the line diagram drawn in (a) (iii) on page 16 in order to achieve this, and state ONE observation that would be expected.

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  1. 4(a)(i)Define the term 'anion'.[1 mark]
  2. 4(a)(ii)What anions will be present in a sample of this electrolyte?[1 mark]
  3. 4(a)(iii)Draw a clearly labelled line diagram to represent an electrolytic cell.[4 marks]
  4. 4(b)Calculate the volume of hydrogen gas liberated at STP, if a current of 965 A is passed through the circuit for 1 hour. (Q = I × t, F = 96 500 C mol⁻¹. At STP,…[5 marks]

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