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Question
(a) Copy and complete the following table, which refers to two practical applications of electrolysis.
| Anode | Electrolyte | Cathode | |
| (i) Silver plating of a spoon | A solution of potassium argentocyanide | ||
| (ii) Purification of copper | |||
| (iii) Extraction of sodium |
(b) Write the equation taking place at the anode for Q. (a).
Solution
(a)
| Anode | Electrolyte | Cathode | |
| (i) Silver plating of a spoon | The plate of pure, clean silver | The solution of potassium argentocyanide | Article to be electroplated |
| (ii) Purification of copper | Impure copper | The solution of copper sulphate and dilute sulphuric acid | The thin strip of pure copper |
| (iii) Extraction of sodium | Nickel, Graphite | Fused sodium chloride | Iron |
(b)
- \[\ce{Ag - e^- -> Ag^+}\]
- \[\ce{Cu - 2e^- -> Cu^{2+}}\]
- \[\ce{Cl^- - e^- -> Cl}\]
- \[\ce{Cl + Cl -> Cl2}\]
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