Electrochemistry Electrolysis

Complete Galvanic Cell

Electrolysis-requires energy Electrolysis with Active Electrodes

Electrochemical cells galvanic cell – spontaneous chemical reaction produces an electric current Electrolytic cell – electric current drives a nonspontaneous reaction Redox reactions involve a transfer of electrons. Zn(s) + CuCl2(aq) g ZnCl2(aq) + Cu(s) Zn(s) + Cu2+(aq) g Zn2+(aq) + Cu(s)

Galvanic vs Electrolytic

Electrolysis Process that involves forcing a current through a cell to produce a chemical change for which the cell potential is negative. Electrolytic cells Electron flow is reversed from galvanic Anode and cathode are reversed from galvanic

Electroplating How much chemical change occurs with the flow of a given current for a specified time? Current is measured in amperes (A). 1 A = 1 C/s

Another Question For You What mass of Cu is plated out when a current of 10.0 A is passed for 30.0 min through a solution containing Cu2+? Cu2+ + 2e-  Cu 30.0 min  (60 s / 1 min) = 1800 s 1800 s  (10.0 C/ 1 s) = 18,000 C 18,000 C  (1 mol e- / 96,485 C) = 0.187 mol e- 0.187mol e-  (1mol Cu / 2mol e-) = 0.094mol Cu 0.094 mol Cu  (63.546 g /1 mol Cu) = 5.94 g Cu

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