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Adam Perez
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Joined: Wed Sep 21, 2016 2:57 pm


Postby Adam Perez » Thu Feb 09, 2017 11:58 pm

14.13 Write the half-reactions, the balanced equation for the
cell reaction, and the cell diagram for each of the following
skeletal equations:
(a) Ni2(aq)  Zn(s) S Ni(s)  Zn2(aq)
(b) Ce4(aq)  I(aq) S I2(s)  Ce3(aq)
(c) Cl2(g)  H2(g) S HCl(aq)
(d) Au+(aq) ---->Au(s) + Au+3(aq)

I am having trouble with part d. I am confused as to how and why they set up the half reactions in that way instead of as follows:

Au+(aq)---->Au(s) Au+(aq)------>Au3+(aq)

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Joined: Wed Sep 21, 2016 2:55 pm

Re: 14-13

Postby stephanieyang_3F » Fri Feb 10, 2017 12:16 am

If you use the half reactions given in the Appendix instead of trying to balance it out on your own you'll find that those are the only two half reactions regarding Au. Also the second half reaction is flipped to become the anode so you can maximize the total standard reduction potential of the cell.

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