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pH = 9 + log 2 --- diedit ----> pOH = 5 - log 2 maka [OH-] = 2 x 10^-5
Kb x [BOH] = [OH-]²
Kb x 0,01 = (2 x 10^-5)²
kb = 4 x 10^-10/10^-2
= 4 x 10^-8