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Posted by on Monday, April 14, 2008 at 2:00pm.

A weak base with a concentration of 1.3 mol/L has a percent ionization of 0.72%. What is the Kb of this weak base?

could someone help me with this question or how to get started?

  • chemistry - , Monday, April 14, 2008 at 2:13pm

    Call the weak base BOH.
    BOH <==> B^+ + OH^-

    Kb = (B^+)(OH^-)/(BOH)

    If 0.72% ionized, that means(H^+) must be 1.3 M x 0.0072 = ??
    Of course (OH^-) must be the same.
    If BOH is 0.72% ionized, it must be 100% - 0.72% unionized.
    Substitute into Kb expression and solve for Kb. Post your work if you get stuck.

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