1) Calculate ? G ? r x n and E ? c e l l for a redox reaction with n = 4 that ha
ID: 801448 • Letter: 1
Question
1) Calculate ?G?rxn and E?cell for a redox reaction with n = 4 that has an equilibrium constant of K = 5.510?2.
2) A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25 ?C. The initial concentrations of Pb2+ and Cu2+ are 5.2010?2M and 1.60M , respectively.
A) What is the initial cell potential?
B) What is the cell potential when the concentration of Cu2+ has fallen to 0.220M ?
3)Copper can be electroplated at the cathode of an electrolysis cell by the half-reaction.
Cu2+(aq)+2e- -->Cu(s). How much time would it take 323mg of copper to be plated at a current of 7.1 A?
4) Silver can be electroplated at the cathode of an electrolysis cell by the half-reaction.
Ag+(aq)+e- -->Ag(s).
What mass of silver would plate onto the cathode if a current of 6.3A flowed through the cell for 65min ?
Explanation / Answer
1] del G not = -RT lnK = -7186J
E* cell = 0.0591/4 * l0g K
=- 0.0186 V
2] the cell potential =- 0.0591/2 [ log 5.2*.01/1.6]
=0.04V
in second case = - 0.0591/2 [ log 5.2*.01/0.22]
=0.01V
3]323*10^-3 = 63.5*7.1*t/F*2
= 138.26 s = time
where F = 96500 C
4] mass deposited = 6.3*65*60*107/1*96500 =27.24 gms
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