Experiment 2 - Determination of Chemical Formulae -...

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Experiment 2: Determination of Chemical Formulae: The Reaction of Zinc and Iodide By Daniela LeutholdLab Instructor: Qi ZhengDue: September 17, 2012Submitted: September 17, 2012
The purpose of this lab was to synthesize and purify zinc iodide by reacting elemental zinc and iodine, employ relative mass to determine Additionally, the purpose of this lab was to evaluate the Law of Mass Conservation by comparing the mass of zinc iodide obtained with the sum of the elemental zinc and iodine masses used in the synthesis. Report Observations, Results, and DiscussionAfter having combined 5 mL of the solution composed of 6 drops of 6 M acetic acid to 10 mL of deionized water to the zinc/iodine mixture, the contents inside of the tube gradually evolved from a yellow substance to dark brown. There was a drastic increase in the temperature of the test tube as the reaction continued to take place. The contents on the bottom of the test tube could be seen; however, after about 15 minutes of having swirled the contents, the solution became colorless and the zinc could be clearly observed. DataMass of Test Tube # 116.134 gMass of Zinc2.005 gMass of Test Tube # 1 + zinc18.137 g(Mass of Test Tube # 1 + zinc) – (Mass of Test Tube) = Mass of Zinc (actual)18.137 g – 16.134 g = 2.003 g ZincMass of Iodine 1.995 g Mass of Test Tube # 1 + zinc + iodine19.673 g (Mass of Test Tube # 1 + Zinc + Iodine) – (Mass of Test Tube # 1) =

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