Calculating Kb: Ph 0.3mol/l Weak Base, 10.66

[humaders99]

The Ph of 0.3mol/l of a weak base is 10.66, calculate kb.

I was thinking of using ph and calculate the concentration of H ions and then calculate poh and OH, but don't know what to do next. Any ideas?

 

[symbolipoint]

This is much like a solution of a weak acid, but now the opposite. Model the work like some of the others in this board and you'll get the answer.

OH- instead of H+;
pOH instead of pH and convert back when ready.
Kb instead of Ka.

Look at some of the guidance which Borek and I have given and make appropriate changes.