We collected 0.994 g of (NH4)2HPO4, which was lower than our recommended initial calculations. This caused (NH4)2HPO4 to become the limiting reactant in our reaction instead of the hydrate, reducing the amount of hydroxyapatite produced. When transferring the reaction solution to the vacuum filter, some remained on the walls of the beaker. Additionally, when we removed the filtered product from the vacuum funnel, some of the product was lost, making our weighed mass of the product less than that actually produced in the reaction. Finally, by testing the solubility of the product in acid, we did it. We did not record the amount of product dissolved in the acids, and so we also lost an unknown amount of product during this step. All of these product losses will contribute to a lower percentage yield calculation when we weigh the dry sample of the