Hydroxyapatite, [Ca₅(PO₄)₃(OH)], the Major Component of Tooth Enamel, Is Attacked

question 22

Multiple Choice

Hydroxyapatite, [Ca₅(PO₄) ₃(OH) ], the major component of tooth enamel, is attacked and decomposed by acids more readily than fluorapatite, [Ca₅(PO₄) ₃F]. Which one of the following reactions is analogous to the reaction of hydroxyapatite?

• A) Ca(s) + 2HCl(aq)   CaCl₂(s) + 2H⁺
• B) CaF₂(s) + 2H⁺(aq)   Ca²⁺(aq) + 2HF(aq)
• C) Ca(O
• H)₂(s) + 2H⁺(aq)   Ca²⁺(aq) + 2H₂O( )
• D) Ca(s) + 2H⁺(aq)   Ca²⁺(aq) + H₂(g)
• E) Ca₃(PO₄)₂(s) + 6H⁺(aq)  3Ca²⁺(aq) + 2H₃PO₄(aq)

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