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Answer on Inorganic Chemistry Question for ramya sarvani

Question #26600
which of the following is least soluble in water?
A)BaF2 B)SrF2 C)MgF2 D)CaF2
Expert's answer
To know what of the substances is least soluble we have to compare their solubility products.
The least soluble substance has the lowest solubility product.
The dissociation equation is

MF2 = M2+ + 2F- , where M2+ is Ba2+, Sr2+, Mg2+, Ca2+

Ksp = [M2+][F-]2

Ksp(BaF2) = 1.7 x 10-6
Ksp(SrF2) = 2.5 x 10-9
Ksp(MgF2) = 6.4 x 10-9
Ksp(CaF2) = 4.0 x 10-11

Answer: The least soluble is CaF2

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