Answered: synthesis of Dibenzalacetone (A) In…

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 is the theoretical mass of the product?

synthesis of Dibenzalacetone (A)
In this lab you will need to determine the amounts of the reactants you will use. We will use 0.0125
moles of acetone. You need to: (1) convert this into a volume in mL, (2) Calculate the number of
moles of benzaldehyde needed based on the balanced chemical reaction, (3) Convert the number of
moles of benzaldehyde into volume in mL. Your reagent table should reflect your calculated values.

Mix the benzaldehyde and acetone based on the volumes from your prelab
calculations in a testtube. Add 25 mL of 10% NaOH solution to a 125 mL
Erlenmeyer flask along with a stir bar and 20 mL of ethanol. Make sure the
temperature of the solution in the flask is below 25 C before proceeding. Add half of
the solution from your test tube to the flask. Allow the solution to stir for 15 minutes
and then add the remainder of the solution. Rinse the test tube with ethanol and allow
the solution to stir for an additional 30 minutes.

Workup (B)

Collect the product with vacuum filtration. While in the Buckner funnel, wash the
product three times with 50-mL of water. The vacuum should be stopped each time
to effectively remove all the sodium hydroxide. The crystals will likely still fairly wet,
attempt to dry to more by pressing a filter paper on top to absorb more water. Purify
most of your product by recrystallizing from ethanol starting with ~ 4 mL for every
gram. More ethanol maybe needed if your product is very wet.

Collecting the Recrystallized M aterial (C) Vacuum filter your cold solution using pre-weighed filter paper, attempting to keep
your stirbar in the Erlenmeyer flask.
Wash the collected crystals (the “filter cake”) with an appropriate rinse solvent. Then
dry your collected solid by allowing air to be pulled through the funnel for about five
minutes or using the heatvac.

Analysis of your Recrystallized M aterial (D) Once you’ve weighed your dry sample of recrystallized product, measure the melting
points of both the crude and recrystallized samples. Analyze the purity with TLC
against the starting material in excess

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