Determination of Chemical Formulae - Determination of...

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Determination of Chemical Formulae: The Reaction of Zinc and Iodine By: William Lynch Lab Partner: Steve Markham Lab Instructor: Ala Swiden Due: September 16 th , 2013
A. Purpose: This lab was intended to verify the Law of Mass Conservation by examining what happens in the reaction of elemental zinc and iodine to form zinc iodide. B. Observations: Part 1: Synthesis of Zinc Iodide 1. Clean, dry test tube: 16.233g 2. Test tube with zinc: 18.248g-16.233g=2.015g zinc 3. Test tube with zinc and iodine: 20.258g-18.248g=2.01g iodine 4. Starting color of zinc and iodine was clear. After adding 5mL of diluted 6M acetic acid, the color changed to a dark orange and then close to a black. The test tube became hot, the mixture bubbled, and there was condensation on the tube. After 5 minutes, the color hadn’t changed much, the test tube was still hot, and the solid zinc from the beginning was still present. After 15 minutes, the mixture showed some clearing up at the bottom. After 25 minutes, the mixture became dark yellow, but clear, with solid zinc present at the bottom.

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