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Topic: pH, adding Strong Base to (buffered?) Solution  (Read 3195 times)

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Offline speedc

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pH, adding Strong Base to (buffered?) Solution
« on: December 03, 2007, 01:54:31 AM »
Calculate the pH after 0.18 mol of NaOH is added to 1.00 L of the solution that is 0.48 M HF and 1.03 M KF.

Is looking up the Ka value of HF required? I looked it up and attempted to use it, but I still am getting a wrong answer. I would really appreciate any help anyone can offer! I've been spending forever on this damn problem..
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Offline Borek

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Re: pH, adding Strong Base to (buffered?) Solution
« Reply #1 on: December 03, 2007, 03:09:35 AM »
pKa = 3.45, yes it is required. Adding NaOH changes both concentration of HF and F-.
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Offline AWK

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Re: pH, adding Strong Base to (buffered?) Solution
« Reply #2 on: December 03, 2007, 07:51:23 AM »
There is a huge concentration of F-. Henderson-Hasselbach formula will give you a pH different from real one by 0.2 to 0.3 pH unit.
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