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What is the molar solubility of CaF2 in 0.10 M NaF solution 25 degrees C? The Ksp...

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Chemistry

What is the molar solubility of CaF2 in 0.10 M NaFsolution 25 degrees C?

The Ksp for CaF2 is3.4x10-11.

The answer is 3.4x10-9 M. Please explain how to getto that answer. Thank you!

Answer & Explanation Solved by verified expert
4.4 Ratings (856 Votes)

               CaF2 -----------> Ca+2 + 2F-

I                                        0          0.1

C                                      +x          +2x

E                                        +x       0.1+2x

   Ksp   = [Ca+2][F-]2

3.4*10-11 = x*(0.1+2x)2

3.4*10-11   = x(0.1+2x)2

     x= 3.39*10-9

[Ca+2] = x = 3.39*10-9 M = [CaF2]
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