Chemistry · May / June 2020 · Paper 42 · Question 5
0620
As printed in the paper
The question as text
Electrolysis of concentrated aqueous sodium chloride using inert electrodes forms chlorine, hydrogen and sodium hydroxide.
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Show the answer and mark scheme
5(a)[2]
breakdown of an ionic compound when molten or in aqueous solution (1)
(using) electricity / electric current / electrical energy (1)
5(b)[1]
platinum / graphite
2H+ + 2e →H2
5(c)[1]
The answer is a drawing: see the picture of this mark scheme row.
5(d)[2]
Na+ H+ Cl - OH-
all four (2) 3 or 2 (1)
5(e)[2]
H+ and Cl - are discharged / removed (1)
Na+ and OH- remain (1)
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