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Tooth enamel consists of hydroxyapatite, Ca5(PO4)3OH (Ksp = 6.8 x10-37). Fluoridated water has dramatically decreased cavities...

Tooth enamel consists of hydroxyapatite, Ca5(PO4)3OH (Ksp = 6.8 x10-37). Fluoridated water has dramatically decreased cavities among children; fluoride ion added to drinking water reacts with Ca5(PO4)3OH to form the more decay-resistant fluoroapatite, Ca5(PO4)3F (Ksp = 1 x10-60). What is the molar solubility (S) of hydroxyapatite and fluoroapatite in water? Hint: Ca5(PO4)3OH dissociates into [Ca5(PO4)3]+ and OH- ions.

Select one:

a. Shydroxyapatite = 8.25 x10-19; Sfluoroapatite = 1.0 x10-30

b. Shydroxyapatite = 1.0 x10-30; Sfluoroapatite = 8.25 x10-19

c. Shydroxyapatite = 6.8 x10-37; Sfluoroapatite = 1.0 x10-30

d. Shydroxyapatite = 8.8 x10-13; Sfluoroapatite = 1.0 x10-20

e. Shydroxyapatite = 5.5 x10-13; Sfluoroapatite = 6.3 x10-21

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