solubility problem

[datdat]

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Hello I am having issues trying to figure out solubility on the following question:

CaF2(Ksp = 4*10 ^-11) in a 0.1M solultion of Ca(NO3)2
what is the solubility of CaF2?

the answer is 1x 10^-5M

could you help me out for this?

 

[dennisDDS]

Hello I am having issues trying to figure out solubility on the following question:

CaF2(Ksp = 4*10 ^-11) in a 0.1M solultion of Ca(NO3)2
what is the solubility of CaF2?

the answer is 1x 10^-5M

could you help me out for this?

CaF2 ==> Ca^2+ + 2F-

Ksp= [Ca][F]^2

4 x 10^-11 = [.1][2x]^2
4 x 10^-11 = [1 x 10^-1]4x^2

4x^2 = 4 x 10^-11 / 1x 10^-1

4x^2 /4 = 4 x 10^-10/4

x^2 = 1 x 10^-10

x= 1 x 10^-5

Just remember whenever you are given two of the same it is the common ion effect.