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Tooth enamel consists of hydroxyapatite, Ca5(PO4)3(OH) with a Ksp of 6.8x10-37. In water the has the...

Tooth enamel consists of hydroxyapatite, Ca5(PO4)3(OH) with a Ksp of 6.8x10-37. In water the has the potential break down using the reaction:

Ca5(PO4)3(OH) (s) « 5Ca2+(aq) + 3PO33-(aq) + OH-(aq)
Fluoride ions are added to the water to react with the Ca5(PO4)3(OH) and form the m ore tooth decay-resistant fluoride apatite, Ca5(PO4)3F (Ksp=1.0x10-60). Fluorinated water has dramatically decrease cavities in children, (a) calculate the solubility of Ca5(PO4)3(OH) in water and (b) will the Ca5(PO4)3F be more or less soluble?

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Answer #1

- Cas (PO4)₂ OH = ksp = 6.8 x 1037 a) det solubility in water = smolar cas (PO4)3OH - 5 cat2 + 3 Pou3 + Ort i ksp 55 35 s Ksp

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