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Q.

CaF2 has a solubility of 1.56×10−3g per 100 mL of solution at  25ºC. Its solubility product is (Atomic mass Ca = 40, F = 19)

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a

6.24×10−9 M3

b

8×10−12 M3

c

3.2×10−11 M3

d

2×10−1 M3

answer is B.

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Detailed Solution

S=1.56×10−3g/100  mL=1.56×10−3×10

g/L=1.56×10−2g/L

S=1.56×10−278=2×10−4mol/L

Ksp=4s3=4×2×10−43=4×8×10−12=3.2×10−11

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