- #1
brbrett
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Homework Statement
Equal Volumes of 3.60 M A2+ and 6.80 M B- are mixed. After the reaction, equilibrium is established with [B-] = 0.40 M.
What is the [A2+] at equilibrium?
Homework Equations
Ice table, algebra
The Attempt at a Solution
This is probably a really easy problem, but I seem to be getting the wrong answer. Probably just a small lapse, but anyways, here's my work.
Equilibrium constant not given.
Ice Table:
A2+ (aq) + 3B- ==><== AB3-
I 3.60 6.80 0
C +x -3x +x
E 3.60 - x 0.40 +x
By subtracting 0.40 from 6.80, I determined 3x to be 6.4.
Using the ratios, I divided 3x by 3 to get 2.13(3 repeating).
Next I subtracted x from 3.60, and got my answer or 1.47.
The answer key says I am wrong, and that [A2+] at equilibrium is 0.80 M.
So am I going about this wrong, or is the book wrong (it has been in the past)?
Thanks!