Chem lab 3 - Determination of Chemical Formulae The...

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Determination of Chemical Formulae: The Reaction of Zinc and Iodine by Alex Wittenberg Lab Instructor: Saba Khan September 25, 2009
Results and Discussion : The purposes of the experiment are to determine synthesize and purify zinc iodide by reacting elemental zinc and iodine, to employ relative mass to determine the empirical formula for zinc iodide, to evaluate the validity of the Law of Mass Conservation, and to investigate chemical reversibility be decomposing zinc iodide back into its constituent elements, zinc and iodine. The reaction between zinc and iodine to produce the ionic compound zinc iodide is written: Zn(s) + I 2 (s) -> Znl 2 (s). Part 1 : -Mass of test tube = 16.318g -Mass of granular zinc obtained = 1.952g -Mass of tube with zinc = 18.246 -Mass by difference of zinc = 1.928g (some of the zinc was lost during the transfer of the zinc to the test tube, so this measurement is necessary). -Mass of test tube with zinc and iodine = 20.345g -Mass by difference of iodine = 2.099g 10mL of water was mixed with 6 drops of 6M acetic acid. Then, 5mL of this solution was added to the zinc/iodine mixture. As the swirling of

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