ELECTROCHEMISTRY

ELECTROCHEMISTRY: 12.6 ELECTROPLATING -         an electrolytic process that deposits a thin, uni version layer of alloy (gold, capital, copper, nickel, chromium, zinc, or tin) on a conducting surface to enhance their esthetical appeal or to provide corrosion protection. -         even non-conducting somatic such as wood, plastic, or leather can be electroplated if first treated with wax or a adorn containing graphite. -         The electroplated object is used as the cathode of an electrolytic cell and the anode is usually the electro coat admixture. -         silver cyanide, potassium cyanide and potassium nose candyate distributively constitute about 4% of the electroplating solution. -         the composition of the electrolyte varies with dissimilar plating process. -         the electrode half-reactions atomic number 18: Anode (oxidation): Ag(s) + 2CN-(aq) Ag(CN)2-(aq) + e- Cathode ( decrease): Ag(CN)2-(aq) + e- Ag(s) + 2CN-(aq) The end result is the transfer of silver from the anode to the cathode.                           Ag(s) Ag(s)                           (anode)          (cathode) electrolytic capacitor Purification of Metals -         electrolytic cells designed for this take consist of some closely-packed anodes and cathodes -         anodes contain the impure metal and the cathodes are thin sheets of genuinely pure metal.

-         When cell in operation, the anodes tardily dissolve as ! pure metal is deposited on the cathodes. The impurities form a gunk on the bottom. Eg. Purification of lead, the impure metal is obtained by reduction of lead(II) oxide with coke, and further reduced by carbon monoxide.         PbO(s) + C(s) Pb(l) + CO(g)         PbO(s) + CO(g) Pb(l) + CO2(g) Anode (oxidation):         Pb(s) Pb2+(aq) +2e- Cathode (reduction):         Pb2+(aq) + 2e- Pb(s) If you want to experience a full essay, order it on our website: OrderEssay.net

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