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September 2, 2015

Homework Help: chemistry

Posted by jessica on Tuesday, November 23, 2010 at 2:38pm.

The Ka of hypochlorous acid (HClO) is 3.0 10-8 at 25C. Calculate the pH of a 0.0385-M hypochlorous acid solution?

i got help with this problem, but i dont get where one of the numbers came from (3.4 x 10^-5)??? i tried makeing 3.0 x 10^-8 the x but i still dont get that number.

start
0.0385
change
-x. . . . .. . +x. . . .+x
at equilibrium
0.0385-x. .. x..... . .x

Ka = 3.0 x 10^-8 = [H+][ClO-]/ [HClO]= (x)(x)/ 0.0385-x

x = [H+]= 3.4 x 10^-5 M
pH = - log 3.4 x 10^-5=4.5

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