Homework Help: Chemistry

Posted by Larry on Wednesday, February 4, 2009 at 10:01pm.

25 mL of a 0.10 M solution of the weak acid hydrofluoric acid, HF, (Ka = 7.2 x 10-4) is titrated with a 0.10 M solution of the weak base ammonia, NH3 (Kb = 1.8 x 10-5). Will the pH at the equivalence point be less than 7, equal to 7, or greater than 7? Explain.

I’m guessing it’s going to be less than 7 because the greater amount of H+ produced from HF since Ka is greater? Or is that wrong??
Or maybe it would be equal to 7 since that's the place where the two are equal??

Chemistry - marsha, Saturday, October 9, 2010 at 3:10pm
THe pH at equivalence point is always 7
Chemistry - Lauren, Tuesday, April 9, 2013 at 9:21pm
Wrong^
The eq. point will be below 7 because the Ka is greater than the Kb --> [H+] is greater than [OH-].

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