If the K_sp of AgCl Is Equal to 3 $\mathrm { AgCl } _ { 2 } ^ { - }$

Multiple Choice

If the K_sp of AgCl is equal to 3.89×10^-10 and the K_f of $\mathrm { AgCl } _ { 2 } ^ { - }$ is 2.8×10⁵, what is the equilibrium constant for the reaction?

A) 1.1×10^-4
B) 6.8×10^-5
C) 2.3×10^-5
D) 5.7×10^-4
E) 9.5×10^-4