Don't forget the "2" in the "1 �2x" term!
2 Cr3+ (aq) + Cd (s) 
2 Cr2+ (aq) + Cd2+ (aq)
I 1.00 M �nbsp; 0 0
C �x �nbsp; +2x +x
E 1.00 �2x �nbsp; 2x x Yep, you will have to solve a cubic equation to get x here! 
0.288 = (2x)2(x) = 4x3
(1 �2x)2 4x2 �4x + 1
Get this in the form ax3 + bx2 + cx + d = 0.
Then you can use the cubic formula to calculate the roots, or more easily, use one of cubic calculators on the Internet:
Good problem!
Steve
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