The sodium Hydroxide question really caught you out year 9. The answers were for all to see on pages 85-86 of your book under the title, “The Chlor-alkali industry” and we have done this as a class practical last term too. Before reading the answers, if you have not already read it, then turn in your books to pages 85-86. The answers follow:
a) Either diagram on Page 86 would be fine as long as it is labelled. Notice that Titanium anodes are used in each case
b) Anode: 2Cl- - 2e -> Cl2 Oxidation
Cathode: 2H+ + 2e-> H2 Reduction
c) A list of uses are at the bottom of page 85
d) The process is very energy intensive as it requires a lot of electricity. However, the three products produced in the process have a large number of uses which makes the process economical.
e) The membrane cell produces ppurer products and causes less pollution than the mercury cell as well as being cheaper.
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