- #1
nautica
I am attempting to put together a galvanic cell with a voltage of 2.68 V
Here is what I used
KCl salt brigde
Cu2+ (aq) + 2e- = Cu(s) Red Potent = +0.34
used 1 M CuSO4
Mg2+ (aq) + 2e- = Mg(s) Red Potent = -2.37
used .1 M MgSO4
Nrtz eq E = E - 0.0257/2 (ln Q)
It gave me a voltage of 1.6 NOT 2.68, which is what it calculated out to be.
So I tried Z(s) with the Cu and it worked
So I switched the MgSO4 for MgCl and got 1.6 again.
My guess is something is reacting with the Cu2+ that has a potential of -1.26
(I used my fingers instead of the KCL and the numbers were the same.
Any ideas of what could be happening?
Thanks
Nautica
Here is what I used
KCl salt brigde
Cu2+ (aq) + 2e- = Cu(s) Red Potent = +0.34
used 1 M CuSO4
Mg2+ (aq) + 2e- = Mg(s) Red Potent = -2.37
used .1 M MgSO4
Nrtz eq E = E - 0.0257/2 (ln Q)
It gave me a voltage of 1.6 NOT 2.68, which is what it calculated out to be.
So I tried Z(s) with the Cu and it worked
So I switched the MgSO4 for MgCl and got 1.6 again.
My guess is something is reacting with the Cu2+ that has a potential of -1.26
(I used my fingers instead of the KCL and the numbers were the same.
Any ideas of what could be happening?
Thanks
Nautica