Aldol Lab
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Title: Aldol Lab

Essay Details:

Subject: Science
Author: Verna H
Date: April 15, 2015
Level: University
Grade: A
Length: 2 / 458

Essay text:

Acetone and other keytones oxidize in this solution only after 2-3 mins. Place 2 drops of the unknown aldehyde and 0.5mL of ethanol in a 10 X 75 nm test tube Add water dropwise, shaking after each drop until the cloudiness produced disappears (if too much water used add 1 or 2 drops of ethanol to give clear colution) add 2 drops of phenylhydrazine and shake the test tube to mix the contents a precipitate forms within a few mins chill the test tube in an ice-water bath and collect the phenylhydrazone by vacuum wash three times with .5 mL of ice-cold ethanol recrystallize the phenylhydrazone from ethanol/water mixed solvent by dissolving the product in ethanol thena ddint water to the hot solution unitl it is just cloudy coool the solution to room temp then chill the recrystallized mixture in an ice-water bath before collecting the crystals on a Hirsch funnel by vacuum filtration allow the phenylhydrazone to dry and then determine mp benzaldehyde 158 4-methylbenzaldehyde 114 4-methoxybenzaldehyde 120 cinnamaldehyde 168

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