Homework Answers
NaF = Na+(aq) + F-(aq)
F-(aq) = 0.25 ( NaF is completely dissociable )
CaF2 = Ca2+(aq) + 2 F-(aq)
S. 2S+0.25(from NaF)
But ksp is very small so F- = 0.25
Ksp = (Ca2+)*(F-)^2
= 1.46*10^-10 = S*(0.25)^2
= 2.336*10^-9 = S
Ca2+ = 2.336*10^-9 M
Now
Moles = molarity* volume
2.336*10^-9*3.75
= 8.76*10^-9
Mass = mole * molar mass
= 8.76*10^-9 * 40.08
= 3.511*10^-7 gram
Or 3.511*10^-4 mg
If you have any questions please comment
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