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### Writing cell diagram: figuring out order

Posted: Thu Feb 04, 2016 9:59 am
When Writing a Cell Diagram, how do we know which order to put the different molecules of the anodes and cathodes in? For instance with the anode: Ag --->Ag+ + e- and the cathode: O3 + H2O + 2e- ---> O2 + 2OH- , the cell diagram is: Ag(s)|Ag+(aq)||OH-(aq)|O3(g),O2(g)|Pt(s)
My question is: why is Ag placed before Ag+ in th cell diagram? And why is OH- placed before O3 and O3 before O2 in the cell diagram? Does this order matter? Or does it only matter that anode on left and cathode on right?

### Re: Writing cell diagram: figuring out order

Posted: Thu Feb 04, 2016 10:32 am
From what it seems to me, in the anode we usually write the (s) form first, before the (aq). I'm not 100% sure why, but it's just a general pattern I've been seeing while doing these problems.

I'm also thinking because it acts as a conductor or some sort, like how we write Pt(s) first on the left-hand side. Maybe someone can confirm/correct this for me?

### Re: Writing cell diagram: figuring out order

Posted: Thu Feb 04, 2016 5:06 pm
I typically just remember it having the solids on the outermost part of the cell diagram.