Experiment 3 - Experiment 3: Synthesis of an Alum Jonathan...

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Experiment 3: Synthesis of an Alum Jonathan M. Brate November 3 rd , 2008 Monday 2:00-5:00 Andrea Kravats Introduction: The purpose of Experiment 3 was to determine the limiting reactant in a reaction between Al, KOH, and H 2 SO 4 , to calculate the percent yield of the product formed, and to determine the solid to liquid transition temperature of the product. The limiting reactant was found by converting the grams of each element or compound into moles and deciding which one had the least number of moles. The percent yield was determined by calculating the theoretical
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yield of the product, and then dividing the actual yield by the theoretical yield and multiplying it by 100%. The solid to liquid transition temperature was determined by heating the product in a beaker of water, whose temperature was being recorded by a temperature probe, and observing when the solid first showed signs of changing to a liquid and when the reaction was complete. Determining the limited reactant and percent yield were two things that were taught in lecture that were practiced in this experiment. A laboratory technique used Experiment 3 was the proper use of a Buchner Funnel apparatus, and also the use of a rubber hose to drain water down the
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Experiment 3 - Experiment 3: Synthesis of an Alum Jonathan...

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