## Writing cell diagram: figuring out order

Rachael_1H
Posts: 31
Joined: Fri Sep 25, 2015 3:00 am

### Writing cell diagram: figuring out order

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?

Tram Vo 2I
Posts: 13
Joined: Thu Oct 08, 2015 3:00 am

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

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?

Rachel Lipman
Posts: 45
Joined: Fri Sep 25, 2015 3:00 am

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

I typically just remember it having the solids on the outermost part of the cell diagram.