Chemical Forums
Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: !!! on February 13, 2008, 10:37:13 PM
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(http://img81.imageshack.us/img81/5047/equilprobtu0.png)
The correct answer is 0.255 M, but I don't know how get to there.
The ICE stands for Initial concentration, Change in concentration, and Concentration at Equilibrium.
Help, please? And thank you!
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Hi,
At the step: 4.56*10-3/[(n-0.228)2] = 6.3, just rearrange to: 4.56*10-3/6.3 = (n-0.228)2].
sqrt both sides: n-0.228 = 0.0269, and solve for n :)
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Your set up is correct, you just made a small error in the calculations.
When you square root both sides of the equation then multiply by (n-0.228) the RHS of the resulting equation should be 2.51n - 0.572 since Sqrt[6.30]*0.228 = 0.572.
[edit: Sev got to it first]
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Oh, dear. I can't believe I overlooked that mistake.
Thank you very much, guys.