Chem Help?

Question

what concentration of nh4cl is necessary to buffer a 0.52 M Nh3 solution at ph=9.00? (Kb for Nh3=1.8*10^(-5))

Answer 1

Step 1:

pH of the equation is 9.00.

Concentration of is 0.52 M.

The equilibrium reaction is :

Definition of pH:

Equilibrium constant for the equation is

Relation between and is .

The concentration of the is 0.936 M.

Solution:

The concentration of the is 0.936 M.