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

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?

• A) Ca(s) + 2HCl(aq) \(\rightarrow\)CaCl₂(s) + 2H⁺
• B) CaF₂(s) + 2H⁺(aq) \(\rightarrow\)Ca²⁺(aq) + 2HF(aq)
• C) Ca(OH)₂(s) + 2H⁺(aq) \(\rightarrow\)Ca²⁺(aq) + 2H₂O(l)
• D) Ca(s) + 2H⁺(aq) \(\rightarrow\)Ca²⁺(aq) + H₂(g)
• E) Ca₃(PO₄)₂(s) + 6H⁺(aq) \(\rightarrow\) 3Ca²⁺(aq) + 2H₃PO₄(aq)

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Definitions:

Soft Tissue Injury

Damage to muscles, ligaments, and tendons as a result of trauma or overuse.

Thermometer

A device used to measure temperature.

Perspiring

The process of sweating, a natural way for the body to regulate its temperature.

Oral Temperature

The body temperature as measured in the mouth with a thermometer, reflecting the core body temperature and used in assessing health status.