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1) High quality Au/Aus+ and Zn/Zn half-cells were connected with a salt bridge. Samples of water containing traces of Au(III)
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Answer #1

a) Zn(S) ------------------ Zn2+(aq) + 2e- E = +0.76 V is the oxidation half cell reaction and

Au3+(aq) + 3e- --------------- Au(S) E= +1.42 V is the reduction half cell reaction

The half cell with higher standard reduction potential has higher tendency to undergo reduction and therefore gold half cell would act as a cathode.

b) E0Cell = EC - EA

= 1.42 - (-0.76) V

E0Cell = 2.18 V

c) 3Zn(S) ------------------ 3Zn2+(aq) + 6e-

2Au3+(aq) + 6e- --------------- 2Au(S)

---------------------------------------------------------

  3Zn(S) + 2Au3+(aq) ------------------ 3Zn2+(aq) + 2Au(S)

---------------------------------------------------------

d) n = 6

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