Find the concentration and pH solution.

1.What is the concentration of Cu2+ in a solution that is 0.10 M Cu(NH3)42+? (Kf = 1.2 x 1012)

 A.8.5 x 10-5

 B.2.8 x 10-4

 C.8.0 x 10-4

 D.5.1 x 10-4

 E.3.8 x 10-4

2.What is the concentration of Ni2+ in a solution that is 1.0 M Ni(NH3)62+? (Kf = 1.8 x 108)

 A.7.2 x 10-4

 B.2.1 x 10-4

 C.1.4 x 10-2

 D.3.2 x 10-4

 E.5.8 x 10-4

3. What is the pH of a solution of 0.65 M acid and 0.51 M of its conjugate base if the pKa = 5.30?

 A.5.19

 B.6.05

 C.5.62

 D.5.85

 E.5.41