Write the ionization for the weak base. I would call it BOH.
Write the Kb expression.
Set up an ICE chart if that will help.
I would call BOH 1.3 M, then concn B^+ = 1.3 x 0.0072.
The unionized BOH is 1.3 x 0.9928,
Substitute these into Kb expression and solve for Kb. post your work if you need further assistance.
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?
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