Quelpr
5 marksElectrochemistry

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

During the electrolysis of acidified water, hydrogen is produced at the cathode: 2H⁺(aq) + 2e⁻ → H₂(g).

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, 1 mol of gas occupies 22.4 L)

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  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(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…[4 marks]

More practice: the rest of this paper · more Electrochemistry questions · all CSEC Chemistry past papers