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For the reaction of hydrazine (N 2H4) in water,
H2NNH2 (aq) + H2O(l) ⇌ H2NNH3+(aq) + OH -(aq)
Kb is 3.0 X 10-6. Calculate the concentrations of all species and the pH of a 2.0-M solution of hydrazine in water.