Nickel and aluminum electrodes are used to build a galvanic cell. What is the theoretical cell potential assuming standard conditions? What is the shorthand notation for this cell?
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 2 half - reactions are:
To get the equation to balance we need to X the first 1/2 equation by 3 and the 2nd half equation by 2 then add to get the overall cell reaction:
The shorthand notation is:
Note the most oxidised form goes next to the salt bridge which is