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April 19, 2014

Homework Help: chemistry - exam practice help!!

Posted by Anya on Wednesday, December 12, 2012 at 10:57pm.

i'm not exactly sure how to do this question :/
i dont even know where to start.

"Determine the equilibrium [F-] of the following solution with initial concentrations od [HF]= 1.296 M and [NaF] = 1,045 M (ka for HF is 6.6 * 10 ^ -4)

options are

a) 1.046
b) 0.251
c) 2.344
d) 8.2 * 10^-4
e) 5.3*10^-4


all i know is that HF is a weak acid
and
that HF dissociates into H+ and F-


:S


any help at all is appreciated!!

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