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# electrode potentials? watch

1. how do we determine which metal electrodes to use.. and which ions to be included in the solution?
2. (Original post by zooshan)
how do we determine which metal electrodes to use.. and which ions to be included in the solution?
Post too vague. I have no idea what you are asking.
3. (Original post by charco)
Post too vague. I have no idea what you are asking.
well..in celll electrode potentials.. how do we determine when to use inert metals like platinum as electrodes? and the solutions.. which ions we have to include in it
4. (Original post by zooshan)
well..in celll electrode potentials.. how do we determine when to use inert metals like platinum as electrodes? and the solutions.. which ions we have to include in it
You have to use a catalytic surface electrode when the potential is between two inos in solution, or in the case of the SHE, between a gas and an ion in solution.

Otherwise you have a metal dipping into a solution of its ions.

The ions are the ones shown in the standard reduction potential equation.

Zn2+(aq) + 2e <==> Zn(s)

Hence, zinc ions in solution and zinc metal dipping in the solution.
5. (Original post by charco)
You have to use a catalytic surface electrode when the potential is between two inos in solution, or in the case of the SHE, between a gas and an ion in solution.

Otherwise you have a metal dipping into a solution of its ions.

The ions are the ones shown in the standard reduction potential equation.

Zn2+(aq) + 2e <==> Zn(s)

Hence, zinc ions in solution and zinc metal dipping in the solution.
how about in the case of cu and zn?
6. (Original post by zooshan)
how about in the case of cu and zn?
I've just shown you zinc!

Copper is the same only with Cu instead of Zn

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