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APElectrochemsample2 - AP Chemistry Electrochemistry Sample...

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AP Chemistry Electrochemistry Sample Problems 2 1. The following oxidation-reduction reaction is spontaneous: Cr 2 O 7 2- (aq) + 14H + (aq) + 6I - (aq) 2Cr 3+ (aq) + 3I 2(s) + 7H 2 O (l) A solution containing K 2 Cr 2 O 7 and H 2 SO 4 is poured into one beaker, and a solution of KI is poured into another. A salt bridge is used to join the beakers. A metallic conductor that will not react with either solution (such as platinum foil) is suspended in each solution, and the two conductors are connected with wires through a voltmeter or some other device to detect an electric current. The resultant voltaic cell generates an electric current. Indicate the reaction occurring at the anode, the reaction at the cathode, the direction of electron and ion migrations, and the signs of the electrodes. 2. For the voltaic cell Zn|Zn 2+ ||Cu 2+ |Cu E o cell = 1.10V and the Zn electrode is the anode. Given that the standard reduction potential of Zn 2+ is –0.76V, calculate the E o red for the reduction of Cu 2+ to Cu.
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