THEORETICAL YIELD: recrystalize trans-cinnamic acid from CH 3 CH 2 OH/H 2 O Weig

Question

THEORETICAL YIELD: recrystalize trans-cinnamic acid from CH3CH2OH/H2O

Weigh out two .5 gram samples of the solid and transfer them to separate 25mL Erlenmeyer flasks.

To each add 4 mL of 95% CH3CH2OH and heat in a 75 degree C hot bath using a 100mL beaker until solid has dissolved.

Once dissolved, remove one flask from the bath and allow it to cool.

To the other flask, add 5-10 drops of water cooled to 10 degrees C using 1mL syringe. Notice the cloudiness where the water drop hits the solution...add cooled water until the cloudiness takes two seconds to dissapear. Then, take the flask from the heat.

Collect both samples by vacuum filtration.

What would the theoretical yield be?

Explanation / Answer

The theoretical is how much product will be synthesized in ideal conditions.

Here the process is only recrystalize trans-cinnamic acid from CH3CH2OH/H2O

If we did recrystalize of trans-cinnamic in ideal conditions we will get same amount of trans-cinnamic. Measn yield is 100 %. But in normal life it is not possible because some quantity of product is lost in process.

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