## Textbook Example 6L.2

JamieVu_2C
Posts: 108
Joined: Thu Jul 25, 2019 12:16 am

### Textbook Example 6L.2

Write the reaction for the cell Pt(s)|H2(g)|HCl(aq)|Hg2Cl2(s)|Hg(l).

The textbook example shows that the reduction half reaction is $Hg_{2}Cl_{2}(s)+2e^{-}\rightarrow 2Hg(l)+2Cl^{-}(aq)$
and that the oxidation half reaction is $H_{2}(g)\rightarrow 2H^{+}(aq)+2e^{-}$.

Why isn't Cl included in the oxidation half reaction for H2 but included in the reduction half reaction for Hg2Cl2?

KDang_1D
Posts: 127
Joined: Fri Aug 30, 2019 12:15 am
Been upvoted: 1 time

### Re: Textbook Example 6L.2

I believe it is in included in the Hg2Cl2 half-reaction since it's part of the solid and relevant to Hg's chemical change. For the H half-reaction, the Cl- is completely dissociated from HCl and therefore is not affecting the H reaction.