Chemical Forums
Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: GP2 on February 08, 2012, 10:19:04 PM
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Lead metal is added to 0.140 M Cr3+(aq).
Pb(s)+2Cr3+(aq) <---> Pb2+(aq)+2Cr2+(aq)
Kc=3.2*10-10
1. What is [Pb2+] at equilibrium?
2. What is [Cr2+] at equilibrium?
3. What is [Cr3+] at equilibrium?
I started with Kc = [Pb2][Cr2+]2 / [Cr3+]2
The terms turn out to [4x]3 / [0.140-2x]2
Do I have to negate the 2x?
I think this turns into a cubic equation, which is why it's giving me some trouble.
EDIT: Solved it!