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Investigation of Hydroxyapatite - Investigation of...

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Investigation of Hydroxyapatite David Mulkey 3/9/2011 Chemistry 118 Section M3 Group Members: Stephan Real and Justin Pollock
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1. The Final Draft of the Procedure: a. In this experiment the limiting reagent of the chemical equation [2H 2 0 + 10Ca(NO 3 ) 2 (s) + 6(NH 4 ) 2 HPO 4 (s) + 8NH 3 → Ca 10 (PO 4 ) 6 (OH) 2 (s) + 20NH 4 NO 3 ] was calcium nitrate [Ca(NO 3 ) 2 ]. Four grams of Ca(NO 3 ) 2 was dissolved in a beaker with 39mL of ammonia (NH 3 ). Then 1.921 grams of [(NH 4 ) 2 HPO 4 ] was dissolved in 39mL of NH 3 in another beaker. These two solutions were mixed and filtered using a Buchner funnel. The mass of the filtered precipitate was recorded as 7.001 grams of hydroxyapatite [Ca 10 (PO 4 ) 6 (OH) 2 (s)]. The pH of the filtrate was found and recorded as a pH of 8. Then the solubility of Ca 10 (PO 4 ) 6 (OH) 2 (s) in acid solutions was found by adding a small amount of the solid to each of the following acid solutions: 1molarity (M) hydrochloric acid (HCl), .1M HCl, .1M citric acid (H 3 Cit), .1M phosphoric acid (H 3 PO 4 ). 2. Solubility of the Sample: a.
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