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Question
Calculate pKa of HF if Ka= 7.2 x 10-4.
Numerical
Solution
Given : Ka = 7 .2 x 10-4 , pKa=?
pKa = - log10 [Ka]
= - log10 (7 .2 x 10-4)
= 4 - log10 7 .2
= 4 - 0 .6573
= 3 .1427
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