22. A 0.10 M solution of the salt BHA has a pH of 6.5 at 25 °C, where B is a weak base and A- is the conjugated base of the weak acid HA. Given that the Kb value for B is 1.0 x 10-6, what is the Ka value for HА?
(A) 1.0 x 10-6
(B) 2.0 x 10-6
(C) 1.0 x 10-8
(D) 1.0 x 10-5
(E) 2.0 x 10-5 

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統計： A(1), B(0), C(0), D(4), E(0) #3847798

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