Equilibrium Question 850

Question: A solution is saturated with respect to SrCO2 and SrF2 The [CO32] was found to be 1.2×103M. The concentration of F in the solution would be Given Ksp,of,SrCO3=7.0×1010M2 , Ksp of SrF2=7.9×1010M3

Options:

A) 1.3×103M

B) 2.6×102M

C) 3.7×102M

D) 5.8×107M

Show Answer

Answer:

Correct Answer: C

Solution:

The two Ksp values do not differ very much. So it is a case of simultaneous equilibria, where the concentration of any species cannot be neglected. [Sr2+][F]2[Sr2+][CO32]=KspSrF2KspSrCO2

=7.9×10107.0×1010=1.128

[F]2=1.128×1.2×103=13.5×104

[F]=(13.5×104)1/2

=3.674×1023.7×102M



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