Electrolytic Cell and Electroplating. Chapter 19 Page 776-781 Chem 12. An electrolytic cell is a device in which an external source of electrons (electrical circuit) is used to make a non-spontaneous redox reaction take place.
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Chapter 19 Page 776-781
2Cl- Cl2 + 2e-
Na+ + 1e- Na
The cathode is still under going reduction, but now is negative.
The anode is still under going oxidation, but now is positive.
= (-1.36 V) + (-2.71 V)
= -4.07 V
A spoon is to be plated with silver, Ag.
1. Cathode = spoon (metal object to be coated), Anode = silver electrode
2. As electrolysis takes place, the silver anode is oxidized,
Ag(s) → Ag+(aq) + 1e-
Ag+ (aq) + 1e- → Ag(s)
A knife to be used as an eating utensil is to be plated with gold, Au.
a) Sketch and label a diagram of the apparatus used to electroplate the knife with gold.
b) Identify the anode and cathode.
c) Write an equation for the reaction taking place at the anode and at the cathode and indicate whether it is oxidation or reduction.
d) What electrolyte is used?