a .20 mol/l solution of the weak base HPO4^2- has a pH of 9.00. find the Kb

Question

solve the following problems. b sure to show all your work and use correct units for your answer. 

Answer 1

This is an ICE table question. HPO4^2- dissociates to PO4^3- and H+. The concentration of PO4^3- is equal to the concentration that you calculate for the H+. Now just solve for Ka. Then do 1.0*10^14/your calculated ka value to get your Kb value.