For hydroxyapatite, (Ca 5 (PO 4 ) 3 OH): a. What is the K sp expression? b. If K

Question

For hydroxyapatite, (Ca5(PO4)3OH):

            a.         What is the Ksp expression?

            b.         If Ksp = 6.8E-37, what is the molar solubility for the compound?

            c.         What is the [Ca2+]?

            d.         What is [PO43-]?

            e.         What is the fluoride transposition equilibrium constant for

Ca5(PO4)3OH + F-

For hydroxyapatite, (Ca5(PO4)3OH): What is the Ksp expression? If Ksp = 6.8E-37, what is the molar solubility for the compound? What is the [Ca2+]? What is [PO43-]? What is the fluoride transposition equilibrium constant for Ca5(PO4)3OH + F- à Ca5(PO4)3F + OH- Ksp for Ca5(PO4)3F = 2.0E-61

Explanation / Answer

a.) What is the Ksp expression?
Ca5(PO4)3OH(s) ? 5Ca^2+(aq) + 3PO4^3-(aq) + OH^-(aq)
Ksp(OH) = 5[Ca^2+]^5[PO4^3-]^3[OH^-] = 6.8

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