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Determination of Chemical Formulae:The Reaction of Zinc and IodinebyAnthony MazzulliLab Instructor: Ryo WakabayashiSeptember 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 1Calculations:Other masses were determined by calculations.mdried zinc= (mass of test tube#1 + dried zinc) – mass of test tube#1= 17.553 g – 16.025 g= 1.528 gmboiling stone= (mass of test tube#2 + boiling stone) – mass of test tube#2= 16.160 g – 16.046 g= 0.114 gmzinc 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 gmreacted zinc= mass of zinc iodide – mass of iodine= 2.479 g – 2.045 g= 0.434 gmzinc+ miodine= 2.028 g + 2.045 g= 4.073 gmdried zinc+ mzinc iodide= 1.528 g + 2.479 g= 4.007 g1Test Tube#1Test Tube #1 +Dried ZincZincIodineTest Tube#2Test Tube#2 + Boiling StoneTest Tube#2 + Boiling Stone + Zinc IodideMass (g)16.02517.5532.0282.04516.04616.16018.639
With this data, and information from the periodic table, an empirical formula for zinc iodide can be calculated.