Download Introduction Magnesium Hydroxide(Mg(OH)2) is a compound

Introduction
Magnesium Hydroxide(Mg(OH)2) is a compound present in most antacid tablets. The mass
percent of magnesium hydroxide can be found using several methods. In This lab titration and
precipitation will be used to find the mass percent of the compound in a certain amount of antacid. First
the antacid will be mixed in a certain amount of water for titration. An indicator will be added to help
determine when the solution is ready. The solution will be titrated using hydrochloric acid (HCl) and
then back titrated using a sodium hydroxide (NaOH) solution. The next step in this experiment is to add
a certain amount of sodium phosphate (Na3PO4) to the solution. The solution will then be filtered and
the precipitate remaining on paper should indicate the amount of Mg(OH)2 in the antacid.
Using common scientific practices and stoichiometry, we were able to successfully to discover
the mass percent of Magnesium Hydroxide (Mg(OH)2) in the anti-acid liquid. We had to find out the
mass percent by using many conversions and stoichiometry from the original equation to the final one.
We found the mass percent of Magnesium Hydroxide in the anti-acid liquid to be .678%. Our data table
recorded the initial and final volumes of Hydrocloric Acid (HCl) and Sodium Hydroxide (NaOH). We also
had to discover the total amount of NaOH in the substance. This came out to be 2.55 milliliters (mL).
After finishing part one of the lab, we had to use a filter paper to get a precipitate to form in the
substance. The mass of the precipitate was found to be .032 grams. By using stoichiometry and the
chemical equation given, we were able to find the grams and mols of Mg(OH)2. The grams were found to
be .0213 grams, and the mols of Mg(OH)2 were 3.65x10-4 mols. Using our data we collected, we were
able to successfully achieve the purpose of the lab, which was to determine the mass percent of
Magnesium Hydroxide in the anti-acid liquid given.