Tooth Enamel Is Composed of the Mineral Hydroxyapatite $\rightleftarrows$ Ca₅ (PO₄)₃⁺(aq) + OH^-(aq)
Ca₅ (PO₄)₃(OH)(s) + H⁺(aq)

question 81

Multiple Choice

Tooth enamel is composed of the mineral hydroxyapatite. It is essentially insoluble in water with K_sp = 2.3 *10^-59, but it reacts with weak acids in the mouth as described by one of the reaction equations below. You can determine the equilibrium constant, K, for this reaction from K_sp and K_w (the equilibrium constant for water autoionization, K_w = 1.0 *10^-14) . What is the value of K?
Ca₅ (PO₄) ₃(OH) (s) $\rightleftarrows$ Ca₅ (PO₄) ₃⁺(aq) + OH^-(aq)
Ca₅ (PO₄) ₃(OH) (s) + H⁺(aq) $\rightleftarrows$ Ca₅ (PO₄) ₃⁺(aq) + H₂O(l)

• A) 2.3* 10^-73
• B) 4.3 * 10⁴⁵
• C) 2.3 * 10^-45
• D) 1.1 *10^-14
• E) 9.9 * 10^-15

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