pOH = 14 – 9.82 = 4.18::: [OH-] = 10^-4.18 = 6,7x10E-5
B + H2O = OH- + HB
Kb = [OH-][HB] / [B]: [OH-] = [HB] ::, = [6.7×10^-5]^2 / 0.10 = 4.5x10E-8
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