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Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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What was the purpose of adding the n-hexanes to the crude oil?
adding an additional 20 mL of ethyl acetate to the funnel with your aqueous layer, then separating the layers. Combine the ethyl acetate layers in a round-bottom flask. Remove the ethyl acetate on the rotary evaporator to yield a crude oil. Add a small amount of n-hexanes via a Pasteur pipette to the oil and cool the mixture to 0 °C. Crystals will form, and these crystals should be filtered using a Buchner funnel. Transfer the filtrate to a round- bottom flask and remove the solvent on the rotary evaporator. This will yield more crude oil that has not yet crystallized. Do a second round of recrystallization by adding more n-hexanes to that oil, cooling it to 0 °C, and filtering the crystals using a Buchner funnel.
Transcribed Image Text:adding an additional 20 mL of ethyl acetate to the funnel with your aqueous layer, then separating the layers. Combine the ethyl acetate layers in a round-bottom flask. Remove the ethyl acetate on the rotary evaporator to yield a crude oil. Add a small amount of n-hexanes via a Pasteur pipette to the oil and cool the mixture to 0 °C. Crystals will form, and these crystals should be filtered using a Buchner funnel. Transfer the filtrate to a round- bottom flask and remove the solvent on the rotary evaporator. This will yield more crude oil that has not yet crystallized. Do a second round of recrystallization by adding more n-hexanes to that oil, cooling it to 0 °C, and filtering the crystals using a Buchner funnel.
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