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2200andbeyond
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Homework Statement
What is the H3O+ concentration of a 0.100 M acetic acid solution (Ka = 1.8 x 10-5)?
a. 1.8 x 10-5
b. 1.8 x 10-4
c. 1.3 x 10-2
d. 1.3 x 10-3
e. 0.9 x 10-3
Homework Equations
The Attempt at a Solution
so the question is supposed to be D. but I thought that The Ka tells the concentration of the H3O+! Doesn't it ?!
I think you're supposed to take the square root of 1.8 x 10-5 the multiply it by 0.1
BUT WHY?!
thanks in advance!