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August 1, 2015

Homework Help: chemistry

Posted by Audrey on Tuesday, November 23, 2010 at 11:44am.

what is the pH of a solution that is .15 M in HOCl and .25 M NaOCl after .05 mol HCl/L has been bubbled into the solution?

this is what I did:
HOCl + H2O ----> H3O+ + OCl-
.15 .25
-.05 +.05
---------------------------
.1 .30

3.5E-8=[H3O][.3]/[.1]
H3O= 1.167E-8
pH= -log(1.67E-8)
pH=7.78

But the answer was 7.46. What did I do wrong?

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