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(OH) 2(s) + 2H+(aq) Ca2+(aq) + 2H2O( ![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? A) Ca(s) + 2HCl(aq) <font face= symbol ></font><font face= symbol ></font>CaCl<sub>2</sub>(s) + 2H<sup>+</sup> B) CaF<sub>2</sub>(s) + 2H<sup>+</sup>(aq) <font face= symbol ></font><font face= symbol ></font>Ca<sup>2+</sup>(aq) + 2HF(aq) C) Ca(OH) <sub>2</sub>(s) + 2H<sup>+</sup>(aq) <font face= symbol ></font><font face= symbol ></font>Ca<sup>2+</sup>(aq) + 2H<sub>2</sub>O( ) D) Ca(s) + 2H<sup>+</sup>(aq) <font face= symbol ></font><font face= symbol ></font>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) <font face= symbol ></font> 3Ca<sup>2+</sup>(aq) + 2H<sub>3</sub>PO<sub>4</sub>(aq)](https://d2lvgg3v3hfg70.cloudfront.net/TB3833/11eaae02_08d5_8580_95d8_7951a72661b8_TB3833_11.jpg)
)
D) Ca(s) + 2H+(aq) Ca2+(aq) + H2(g)
E) Ca3(PO4) 2(s) + 6H+(aq) 3Ca2+(aq) + 2H3PO4(aq)
Correct Answer:
Verified
Correct Answer:
Verified
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