# Chem 2070 Lab#1 - Determination of Chemical Formulae The...

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Determination of Chemical Formulae: The Reaction of Zinc and Iodine by Anthony Mazzulli Lab Instructor: Ryo Wakabayashi September 16, 2011
Purpose: The Purpose of the experiment is to synthesize and purify zinc iodide, evaluate the Law of Conservation of Mass, determine the chemical formula of zinc iodide, and investigate chemical reversibility. Data: Masses of several substances and instruments were measured and recorded in Table 1 . Table 1 Calculations: Other masses were determined by calculations. m dried zinc = (mass of test tube#1 + dried zinc) – mass of test tube#1 = 17.553 g – 16.025 g = 1.528 g m boiling stone = (mass of test tube#2 + boiling stone) – mass of test tube#2 = 16.160 g – 16.046 g = 0.114 g m zinc iodide = (mass of test tube#2 + boiling stone + zinc iodide) – (mass of test tube#2 + boiling stone) = 18.639 g – 16.160 g = 2.479 g m reacted zinc = mass of zinc iodide – mass of iodine = 2.479 g – 2.045 g = 0.434 g m zinc + m iodine = 2.028 g + 2.045 g = 4.073 g m dried zinc + m zinc iodide = 1.528 g + 2.479 g = 4.007 g 1 Test Tube#1 Test Tube #1 + Dried Zinc Zinc Iodine Test Tube#2 Test Tube#2 + Boiling Stone Test Tube#2 + Boiling Stone + Zinc Iodide Mass (g) 16.025 17.553 2.028 2.045 16.046 16.160 18.639
With this data, and information from the periodic table, an empirical formula for zinc iodide can be calculated.