# Consider the 2 half - cells : #sf(Cu^(2+)+2erightleftharpoonsCu)# #sf(E^(@)=+0.34"V")# #sf(Ag^(+)+erightleftharpoonsAg)# #sf(E^(@)=+0.80"V")# What is the solution to the points below?

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What is the standard emf of the cell formed from the two 1/2 cells ?

What is the emf of the cell formed from the two half - cells if #[Cu^(2+)]=0.130M# and #[Ag^(+)]=0.0001M# ?

What is the standard emf of the cell formed from the two 1/2 cells ?

What is the emf of the cell formed from the two half - cells if

##### 1 Answer

#### Explanation:

List the 1/2 equations in order least positive to most positive:

Note we use the

The 1/2 cell with the most +ve

From this we can see that the 2nd 1/2 cell will be driven left to right and the 1st 1/2 cell right to left in accordance with the arrows.

So the cell reaction when it is working is:

Because **least** +ve value from the **most** +ve:

To find the emf of the cell under non - standard condition we need to use the Nernst Equation. At

Putting in the numbers: