Posted by A on Thursday, March 7, 2013 at 4:39pm.
(LiF) = grams/molar mass = 5/about 26 = about 0.2M but you should do it more accurately.
.......HF ==> H^+ F^-
I......1.25...0...0.2M
C......-x.....x....x
E.....1.25-x..x...0.2+x
Ka HF = (H^+)(F^-)/(HF)
Substitute the E line and solve for x, then convert to pH.
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