Hydroxyapatite, Which Is a Component of Tooth Enamel, Is Very $\rightleftarrows$

question 5

Multiple Choice

Hydroxyapatite, which is a component of tooth enamel, is very insoluble in water. For the following reaction, K_sp = 2.3 *10^-59.
Ca₅(PO₄) ₃(OH) (s) $\rightleftarrows$ Ca₅(PO₄) ₃⁺(aq) + OH^-(aq)
What is the molar concentration of Ca₅(PO₄) ₃⁺ when the pH of the mouth is 4.0?

• A) 2.3 * 10^-49 M
• B) 2.3 * 10^-59 M
• C) 2.3* 10^-55 M
• D) 2.3 *10^-63 M
• E) 0, teeth don't dissolve!

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