Homework Help: Chemistry

Posted by Jonah on Friday, March 22, 2013 at 12:35pm.

A tank contains exactly 10^(6)liters of pure water. 1.0*10^(-6) moles of HCl (g) is bubbled into this tank. What is the resulting pH?

The answer is 7, but I was only able to deduce that based on the fact that water has a neutral pH, but there's a mathematical way to do it and I'm not sure how to go about it.

Chemistry - Simon Mai, Friday, March 22, 2013 at 4:54pm
I dont know.
Chemistry - DrBob222, Friday, March 22, 2013 at 6:30pm
HCl is a strong acid meaning that it dissociates 100%; therefore, 1E-6 mol/1E6L = 1E-12M HCl.
HCl ==> H^ + Cl^-
1E-12...0.....0
-1E-12..1E-12..1E-12

..........HOH ==> H^+ + OH^-
I...............1E-12....0
C..................x......x
E..............1E-12+x....x

(H^+)(OH^-) = Kw = 1E-14
(1E-12+x)(x) = 1E-14
Solve the quadratic. I get all of these numbers on the calculator like
9.99995E-8
pH = -log(H^+) = 7.00000.
With no temperature listed I couldn't look up the correct value for Kw at that particular temperature but I think this will do the trick.

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