- #1
ThirdEyeBlind
- 12
- 0
Homework Statement
Line Notation Fe | Fe^(2+) (0.587) || Cd^(2+) (1.009) | Cd
T = 297 K
E(cell standard) = .04 V
Find the potential when [Fe^(2+) changes by .393 M
Work
Cd^(2+) + Fe --> Cd + Fe^(2+)
Q = [Fe^(2+)] / [Cd^2+]
Q= [.587 + .393] / [1.009-.393]
The Attempt at a Solution
After I got the problem wrong and I worked backwards to get the answer but I am not sure I understand it. When finding the Q value, how do I know to add .393 M to Fe^2+ and subtract .393 M from Cd^(2+)? To me the question is vague and just says changes by .393 M, not increase or decrease so how I know [Fe^2+] must increase?
Thanks