## Calculating standard potential of cell

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Emily Huang 1E
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

### Calculating standard potential of cell

Do you switch the sign of standard E, (cell potential), when you reverse a reaction or does the sign remain the same?

Joanna Pham - 2D
Posts: 113
Joined: Fri Apr 06, 2018 11:04 am

### Re: Calculating standard potential of cell

When you switch the reaction, the standard potential sign is reversed.

However, it is important to note that if you multiply an entire chemical equation by a number, you DO NOT multiple the standard potential by that number. You only that for standard gibb free energy of the reaction. For example if you have Zn + CU2+ -> Zn2+ + Cu (standard potential = 1.10 V and standard gibbs = -212 kJ ) and you multiply the equation by 2 to get 2Zn + 2CU2+ -> 2Zn2+ + 2Cu, then the standard potential remains as 1.10 V but standard gibbs increases to -424 kJ.

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