Question

A 50.0-mL sample of 0.100 M Ca(NO3)2 is mixed with 50.00 mL of0.200 M NaF. When the system has come to equilibrium, which of thefollowing sets of conditions will hold? The Ksp for CaF2 is 4.0 x10-11.

Moles Solid CaF2 Formed [Ca2+] (M) [F-] (M)

A. 5.0 x 10-3 3.5 x 10-4 M 7.0 x 10-4 M

B. 5.0 x 10-3 3.4 x 10-9 M 0.05 M

C. 5.0 x 10-3 2.2 x 10-4 M 4.3 x 10-4 M

D. 5.0 x 10-3 3.5 x 10-4 M 4.3 x 10-4 M

E. 10.0 x 10-3 1.3 x 10-5 M 1.3 x 10-5 M




Please show how you calculated the problem. Thanks!