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Tooth enamel is composed of hydroxyapatite, whose simplest formula is Ca5(PO4)3OH, and whose corresponding Ksp = 6.8 × 10-27. As discussed in the “Chemistry and Life” box on page 755, fluoride in fluorinated water or in toothpaste reacts with hydroxyapatite to form fluoroapatite, Ca5(PO4)3F, whose Ksp = 1.0 × 10-60. (a) Write the expression for the solubility-constant for hydroxyapatite and for fluoroapatite. (b) Calculate the molar solubility of each of these compounds.

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Irving Heathcote
Irving HeathcoteLv2
13 May 2020

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Related questions

EDTA ANALYSIS QUESTION HELP PLEASE!!



Hydroxyapatite is the primary constituent of tooth enamel andis the hardest substance in the human body.Addition of F- to drinking water convertsHydroxyapatite to Fluoroapatite, (Ca5(PO4)3F.the Ksp of Hydroxyapatite, (Ca5(PO4)3F is 6.8 X 10-37 and the Ksp for Fluoroapatite is 1 X 10-60. [Other pertinent K values can be found elsewhere (i.e. onlineor in textbooks) if necessary]


a)A) Write aseries of equilibrium expressions, a mass balance charge and acharge balance representing the complete reaction of thehydroxyapatite, including the solubility, and the further reactionof phosphate with water.

b)B) Write aseries of equilibrium expressions, a mass balance charge and acharge balance representing the complete reaction of thehydroxyapatite, including the solubility, and the further reactionof phosphate and Fluoride with water.

c)C) Calculatethe [Ca+2] in a saturated solution ofhydroxyapatite buffered at pH = 6.5, assuming further reaction ofPO4-3

d)D) Calculatethe [Ca+2] in a saturated solution ofFluoroapatite buffered at pH = 6.5, assuming further reaction withwater occur.

e)E) Comment ofthe significance of the results of part (C) and (d). why do youthis it is a good idea to fluoridate drinking water?

f)F) Write aseries of equilibrium expressions, a mass balance and a chargebalance representing the complete reaction of 0.01 M H4EDTA

g)G) Calculatethe [Ca+2] in a saturated solution ofhydroxyapatite containing 0.01M H4EDTABuffered at 6.5.

h)H) Calculatethe [Ca+2] in a saturated solution ofFluoroapatite containing 0.01M H4EDTABuffered at 6.5.

i)I) Smallamounts of EDTA are used as preservative in some foods. Comment onwhy this might not be a good idea


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