Writing a redox reaction from a cell diagram

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Elizabeth Bowen 1J
Posts: 53
Joined: Wed Nov 14, 2018 12:20 am

Writing a redox reaction from a cell diagram

Postby Elizabeth Bowen 1J » Wed Mar 04, 2020 3:29 am

Why when we write a redox reaction from a cell diagram do we not balance it out the same way as how we learned for redox reactions in general? For example, on page 552 they have the cell diagram Pt(s) | H2(G) | HCl(aQ) | Hg2Cl2(s) | Hg(l), and they write out the oxidation reaction as
1/2 H2(g) --> H+(aq) + e-

Why do they balance the hydrogen in this redox reaction by adding the coefficient of 1/2 to H2(g) instead of adding H+ to that side to get another H atom? I was thinking it's because they didn't specify the cell as acidic/basic, but aren't most reactions acidic/basic, so it would be unlikely that this one's neutral?

Fatemah Yacoub 1F
Posts: 114
Joined: Thu Jul 11, 2019 12:16 am

Re: Writing a redox reaction from a cell diagram

Postby Fatemah Yacoub 1F » Wed Mar 04, 2020 10:28 am

In the following step they end up multiplying by 2 so I don't think it matters that much which way you attempt it. In the end it the solution is the same.


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