What is the Ka for an unknown monoprotic acid HX, given that a solution of 0.10 M LiX has a pH of 8.90?
a) 7.9 x 10 -6
b) 4.3 x 10 -8
c) 6.2 x 10 -10
d) 2.6 x 10 -10
e) 1.6 x 10 -5
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