Question

Calculate the solubility of LaF3 in grams per liter in the following solutions. The Ksp of LaF3 is 2.01 e-19.
(a) pure water

(b) 0.051 M KF solution

(c) 0.065 M LaCl3 solution

Answer 1

LaF3 ==> La^+3 + 3F^-

Ksp = (La^+3)(F^-)^3

Set up an ICE chart, substitute into Ksp and solve for solubility. Post your work if you get stuck.

Answer 2

c)
1.79x10^-5