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# Need a hand with drawing up cell diagrams. watch

1. I missed the lesson on it! :P Tried to look it up, but i'm a bit confused.

I've been given half equations and the electrode potentials.
How do I use these to draw out the cell diagrams?

2. try this
http://www.chemguide.co.uk/physical/...tions.html#top

or this
http://www.chemguide.co.uk/physical/...ction.html#top

does that give you what you're looking for?
3. (Original post by Plato's Trousers)
try this
http://www.chemguide.co.uk/physical/...tions.html#top

or this
http://www.chemguide.co.uk/physical/...ction.html#top

does that give you what you're looking for?
Yeah! Thanks, found it in second one..

Lets see if I got this right then!
Ag+ + e- -> Ag 0.80V
Mg2+ + 2e- -> Mg -2.36
Ag+ + Mg -> Mg2+ + Ag

Mg | Mg2+ || Ag+ | Ag

Cell E.M.F = 0.80 - (-2.36) = 3.16

Is that right?

I saw Pt(s) on some of the cell diagrams, what's that about?
4. (Original post by Luke0011)
Yeah! Thanks, found it in second one..

Lets see if I got this right then!
Ag+ + e- -> Ag 0.80V
Mg2+ + 2e- -> Mg -2.36
Ag+ + Mg -> Mg2+ + Ag

Mg | Mg2+ || Ag+ | Ag

Cell E.M.F = 0.80 - (-2.36) = 3.16

Is that right?

I saw Pt(s) on some of the cell diagrams, what's that about?
It's an inert platinum electrode, which is needed to act as a catalytic surface for some redox couples to react on.
5. (Original post by charco)
It's an inert platinum electrode, which is needed to act as a catalytic surface for some redox couples to react on.
Ah okay, thanks!

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