14.13d

Moderators: Chem_Mod, Chem_Admin

Shannon Wasley 2J
Posts: 71
Joined: Fri Sep 29, 2017 7:06 am
Been upvoted: 1 time

14.13d

Postby Shannon Wasley 2J » Thu Feb 22, 2018 9:57 pm

Why are the half reactions Au+(aq) + e- --> Au(s) and Au(s) --> Au3++ 3e-?

Hannah Chew 2A
Posts: 76
Joined: Fri Sep 29, 2017 7:05 am
Been upvoted: 2 times

Re: 14.13d

Postby Hannah Chew 2A » Fri Feb 23, 2018 12:21 pm

I had the same question because gold solid is not a reactant in the overall reaction. However, when you balance the half reactions (with gold solid being the reactant of the second half reaction) and sum them, the overall reaction matches the reaction stated in the problem.

Deap Bhandal L1 S1J
Posts: 77
Joined: Fri Sep 29, 2017 7:05 am
Been upvoted: 2 times

Re: 14.13d

Postby Deap Bhandal L1 S1J » Fri Feb 23, 2018 12:26 pm

After multiplying the first reaction by 3 the Au on the left side of half reaction 2 will cancel out one of these on half reaction 1. If you are wondering why the electrons are on different sides for the reactions this is simply because Au is losing and gaining electrons. These are unique reactions where a substance is being oxidized and reduced at the same time.

Clara Hu 1G
Posts: 50
Joined: Sat Jul 22, 2017 3:00 am
Been upvoted: 1 time

Re: 14.13d

Postby Clara Hu 1G » Fri Feb 23, 2018 1:03 pm

This is what happens in a concentration cell.


Return to “Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams”

Who is online

Users browsing this forum: No registered users and 1 guest