Hydroxyapatite, Which Is a Component of Tooth Enamel, Is Very

question 64

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. 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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