What is the purpose of using NaOH? Perform a steam distillation of benzaldehyde. Set up your apparatus according to Figure 19.1-on-p. 139 of Zubrick (you may use a graduated cylinder or an Erlenmeyer flask for collectioninstead of the round-bottom flask in the picture). Weigh about 10 g of benzaldehyde into your250-mL round-bottom flask. The exact amount is not critical, but you should know what themass is to two decimal places. Add about 100 mL of water and a magnetic stir bar to the flask,then swirl the flask a few times to make sure the contents are adequately mixed. Place the heatsource on a stirplate. For your heat source, use a 500-mL thermowell and use sand to fill in thegaps around the flask. Ask your instructor or a laboratory assistant to check your apparatusbefore you begin heating. Once your set-up has been approved, stir the mixture and run thedistillation until you have collected about 20 mL of distillate. Be sure to note the temperaturereadings when you begin collecting distillate and when you stop.At your fume hood, dissolve your distillate in approximately 100 mL of ether, and transfer thesolution to your separatory funnel. Separate the water. To the separatory funnel, add a volumeof 10 or 20% aqueous NaOH solution that is approximately one half the volume of ether youused (i.e., ~50 mL).-Which layer is on the top, and which is on the bottom?-What is the purpose of using NaOH solution instead of distilled water? (Hint: What kinds ofcompounds does NaOH react with?)

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What is the purpose of using NaOH?

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter83: Simple Distillation

Section: Chapter Questions

Problem 2P

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Question

What is the purpose of using NaOH?

Perform a steam distillation of benzaldehyde. Set up your apparatus according to Figure 19.1-on-
p. 139 of Zubrick (you may use a graduated cylinder or an Erlenmeyer flask for collection
instead of the round-bottom flask in the picture). Weigh about 10 g of benzaldehyde into your
250-mL round-bottom flask. The exact amount is not critical, but you should know what the
mass is to two decimal places. Add about 100 mL of water and a magnetic stir bar to the flask,
then swirl the flask a few times to make sure the contents are adequately mixed. Place the heat
source on a stirplate. For your heat source, use a 500-mL thermowell and use sand to fill in the
gaps around the flask. Ask your instructor or a laboratory assistant to check your apparatus
before you begin heating. Once your set-up has been approved, stir the mixture and run the
distillation until you have collected about 20 mL of distillate. Be sure to note the temperature
readings when you begin collecting distillate and when you stop.
At your fume hood, dissolve your distillate in approximately 100 mL of ether, and transfer the
solution to your separatory funnel. Separate the water. To the separatory funnel, add a volume
of 10 or 20% aqueous NaOH solution that is approximately one half the volume of ether you
used (i.e., ~50 mL).
-Which layer is on the top, and which is on the bottom?
-What is the purpose of using NaOH solution instead of distilled water? (Hint: What kinds of
compounds does NaOH react with?)

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