Answered: Tooth enamel is composed of…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Question

Tooth enamel is composed of hydroxyapatite, whose simplest
formula is Ca₅(PO₄)₃OH, and whose corresponding
Ksp = 6.8 x 10^-27. As discussed in the Chemistry and Life
box on page 746, fluoride in fluorinated water or in toothpaste
reacts with hydroxyapatite to form fluoroapatite,
Ca₅(PO₄)₃F, whose Ksp = 1.0 x 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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