Question

Hydroxyapatite, Ca₅(PO₄)₃(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. (b) What mass (g) of hydroxyapatite could form from 100. g of 85% phosphoric acid and 100. g of calcium hydroxide?

Answer 1

The equation of the reaction is:

         5Ca(OH)₂ + 3H₃PO₄ ---> Ca₅(PO₄)₃(OH) + 9H₂O.

Based on the data provided, the mass of hydroxyapatite formed is  135.62 g.

What is hydroxyapatite ?

Calcium apatite has the chemical formula Ca5(PO4)3(OH), however it is most commonly written Ca10(PO4)6(OH)2 to indicate that the crystal unit cell consists of two entities. Hydroxyapatite, also known as hydroxylapatite (HA), is a naturally occurring mineral form of calcium apatite. The complex apatite group's hydroxyl endmember is called hydroxyapatite. Fluorapatite or chlorapatite can be created by substituting fluoride, chloride, or carbonate for the OH ion. It forms a hexagonal crystal structure when it crystallizes. Powdered hydroxyapatite is completely white. Apatites that are found in nature can also exhibit colorations that resemble dental fluorosis, such as brown, yellow, or green.

Human bone contains up to 50% by volume and 70% by weight of bone mineral, a modified form of hydroxyapatite.

To learn more about hydroxyapatite from the given link:

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