% dissociation = (x*100)/c
22= x*100/8*10^-2
x = 1.76*10^-2
B dissociates as:
B +H2O -----> BH+ + OH-
8*10^-2 0 0
8*10^-2-x x x
Kb = [BH+][OH-]/[B]
Kb = x*x/(c-x)
Kb = 1.76*10^-2*1.76*10^-2/(0.08-1.76*10^-2)
Kb = 4.964*10^-3
Answer: a
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