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Hydroxyapatite [Ca5(PO4)3(OH)],the Major Component of Tooth Enamel,is Attacked and Decomposed \to

Question 74

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 with acid?


A) Ca(s) + 2 HCl(aq) \to CaCl2(s) + 2 H+
B) CaF2(s) + 2 H+(aq) \to Ca2+(aq) + 2 HF(aq)
C) Ca(OH) 2(s) + 2 H+(aq) \to Ca2+(aq) + 2 H2O(  Hydroxyapatite [Ca<sub>5</sub>(PO<sub>4</sub>) <sub>3</sub>(OH) ],the major component of tooth enamel,is attacked and decomposed by acids more readily than fluorapatite [Ca<sub>5</sub>(PO<sub>4</sub>) <sub>3</sub>F].Which one of the following reactions is analogous to the reaction of hydroxyapatite with acid? A) Ca(s) + 2 HCl(aq)  \to  CaCl<sub>2</sub>(s) + 2 H<sup>+</sup> B) CaF<sub>2</sub>(s) + 2 H<sup>+</sup>(aq)  \to  Ca<sup>2+</sup>(aq) + 2 HF(aq)  C) Ca(OH) <sub>2</sub>(s) + 2 H<sup>+</sup>(aq)  \to  Ca<sup>2+</sup>(aq) + 2 H<sub>2</sub>O(   )  D) Ca(s) + 2 H<sup>+</sup>(aq)  \to  Ca<sup>2+</sup>(aq) + H<sub>2</sub>(g)  E) Ca<sub>3</sub>(PO<sub>4</sub>) <sub>2</sub>(s) + 6H<sup>+</sup>(aq)  \to   3 Ca<sup>2+</sup>(aq) + 2 H<sub>3</sub>PO<sub>4</sub>(aq)  )
D) Ca(s) + 2 H+(aq) \to Ca2+(aq) + H2(g)
E) Ca3(PO4) 2(s) + 6H+(aq) \to 3 Ca2+(aq) + 2 H3PO4(aq)

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