Equilibrium Question 788

Question: lf Ksp of CaF2 at 25C is 1.7×1010 , the combination amongst the following which gives a precipitate of CaF2 is

Options:

A) 1×102MCa2+ and 1×103MF

B) 1×104MCa2+ and 1×104MF

C) 1×102MCa2+ and 1×105MF

D) 1×103MCa2+ and 1×105MF

Show Answer

Answer:

Correct Answer: A

Solution:

When ionic product i.e. the product of the concentration of ions in the solution exceeds the value of solubility product, formation of precitpiate occurs. CaF2Ca2++2F Ionic product =[Ca2+][F]2 When, [Ca2+]=1×102M

[F]2=(1×103)2M

=1×106M

[Ca2+][F]2=(1×102)(1×106)=1×108 In this case, Ionic product (1×108)> solubility product (1.7×1010)



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