Question

14. Drawn below are the structures of three diprotic weak bases: HN HN NH N Piperazine Kb = 5.3 x 10-5 Kb2 = 4.5 x 10-9 1-methylpiperazine Kb1 = 3.7 x 10-5 Kb2 = 1.7 x 10-9 1,4-dimethylpiperazine Koi = 1.4 x 10-5 Kb2 = 4.3 x 10-10

Answer 1

lower pKb indicates a strong base.

piperazine

pkb= -log(5.3×10^-5) =4.2757

1-methylpiperazine.

pkb= -log(3.7×10^-5) =4.4318

1,4-dimethylpiperazine.

pkb= -log(1.4x10^-5) = 4.8539

order of basacity.

piperazine > 1-methylpiperazine > 1,4-dimethylpiperazine

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