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?
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
To find the emf of the cell under non - standard condition we need to use the Nernst Equation. At
Putting in the numbers: