Fluoride treatment strengthens tooth enamel by converting hydroxyapatite, Ca5(PO4)OH, into fluorapatite, Ca5(PO4)3F. Fluoraparite is stronger and more resistant to acid than hydroxyapatite. If the solubility of fluorapatite is 6.1 x 10^-8 mol/L, what is its Ksp?  Ca5(PO4)3F(s) -> 5Ca^2+ + 3PO4^3-  + F-

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Chapter12: Chemical Equilibrium
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Fluoride treatment strengthens tooth enamel by converting hydroxyapatite, Ca5(PO4)OH, into fluorapatite, Ca5(PO4)3F. Fluoraparite is stronger and more resistant to acid than hydroxyapatite. If the solubility of fluorapatite is 6.1 x 10^-8 mol/L, what is its Ksp? 
Ca5(PO4)3F(s) -> 5Ca^2+ + 3PO4^3-  + F- 

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