Lab Report 3

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Allan Hancock College *

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150

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Chemistry

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Dec 6, 2023

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Experiment #3 Limiting Reactants: The Reaction of Zinc with Iodine 9/9/2019 Abstract: In this lab, we observed the reaction between Zinc and Iodine. One of the reactants was the limiting reactant and the other was the excess. At the end of the experiment, the percent yield and empirical formula was calculated. Introduction: The purpose of this lab is to perform a synthesis reaction between zinc and iodine, determine the percent yield, and identify errors made during the reaction and state how it affected the overall yield. In the chemical laboratory, iodine is a chemical element that is the heaviest of the halogens. It can cause severe burns and is corrosive to metal. Ethanol vapor is toxic and flammable. Procedure: - We transferred 0.5 cm zinc to weighing bottle then obtained a vial containing Iodine
- Determined the mass of 125 ml erlenmeyer flask - Measured about 1.5 20-mesh granular Zinc from weighing bottle and weighed by difference - Measured the mass of iodine in its vial with the cap and poured the remains into the flash and remeasured it - Recorded the mass of sample that was transferred - Added 35ml of ethanol to the flask with the reactants - Loosely covered the flask with a piece of aluminum foil, and placed it on a hot plate - Determined the mass of the clear 150ml beaker - Decanted the liquid from the flask into the beaker - Washed the ethanol onto unreacted solid to wash the product away from the remaining zinc, and swirled for about 15 seconds and repeated - Placed the flask on a hot plate to dry - Placed the beaker with the dissolvent on a hot plate - Gently boiled to evaporate the solvent and cleaned Observations/Data: Masses: Sample of Zinc- 19.6802 g
125ml Erlenmeyer flask- 80.9464 g ~1.5 g sample of 20-mesh granular zinc transferred into flask- 18.2419 g Flask after transfer- 82.3810 g Mass of Iodine bottle with cap- 19.6125 g Mass of Vial plus cap for Iodine- 18.2412 g Transferred Iodine- 1.373 g 150ml beaker- 68.6848 g Remaining sample in flask- 82.0784 g Beaker with dry product- 70.4038 g After the instructor demo, the iodine omitted a pink gas and dissolved into the air which meant that iodine was the limiting reactant. The remaining zinc was the excess. Ethanol was a deep yellow when added to flask with reactants. It gradually became lighter as it was heated. Data Analysis and Calculations: Results and Discussions: Uncertainty: Some possible errors that may have occurred during this lab is inaccurately measuring grams from the machines. Another error could be caused by loss of reagents from transfer that became unattainable(spilling). Another possible error could have been
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