### Narceine is a narcotic in opium that crystallizes…

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Problem 99

Hydroxyapatite, $\mathrm{Ca}_{5}\left(\mathrm{PO}_{4}\right)_{3}(\mathrm{OH}),$ is the main mineral component of dental enamel, dentin, and bone. Coating the compound on metallic implants (such as titanium alloys and stainless steels) helps the body accept the implant. When placed in bone voids, the
powder encourages natural bone to grow into the void. Hydroxyapatite is prepared by adding aqueous phosphoric acid to a dilute slurry of calcium hydroxide. (a) Write a balanced equation for this
preparation. (b) What mass $(\mathrm{g})$ of hydroxyapatite could form from $100 . \mathrm{g}$ of 85$\%$ phosphoric acid and $100 . \mathrm{g}$ of calcium hydroxide?

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Chapter 3
Stoichiometry of Formulas and Equations
CHEMISTRY: The Molecular Nature of Matter and Change 2016

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