Determine Ka of the weak acid HX knowing that 0.10M
solution of LiX has pH of 8.90
Homework Answers
LiX is salt of strong base and weak acid.
for such salts
pH = 1/2 [pKw + pKa + log C]
8.90 = 1/2 [14 + pKa + log 0.10]
17.80 = 13 + pKa
pKa = 4.80
Ka = 10-pKa = 10-4.8
Ka = 1.60 x 10-5
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