Chemistry 2 - Acids and Bases

Hydrazine (NH2NH2) is a weak base that ionizes in water as follows.

NH2NH2(aq) + H2O(l) <==> HNH2NH2^+(aq) + OH^−(aq)

Calculate the concentration of OH^− ions in a 0.20 M solution of hydrazine, given that the base-dissociation constant (Kb) for hydrazine is 1.3 ✕ 10^−6. (Note that 0.20 M is known as the initial, formal, or total concentration of hydrazin.)

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  1. hydrazine = BH
    ......BH + H2O ==> BH2^+ + OH^-
    I....0.2M...........0.......0
    C.....-x............x.......x
    E....0.2-x..........x.......x

    Write the Kb expression, plug in the E line and solve for x = OH^-

    Post your work if you get stuck.

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