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CHEM3322 EXPERIMENT 3: Extraction Name: ID: Q1. Give three criteria for a good extraction solvent. Q2. Write a balanced chemical equation for the acid-base reactions involved in this experiment. Q3. Which is the bottom phase in a water/methylene chloride (d=1.325) system? Briefly explain your predictions

CHEM3322 EXPERIMENT 3: Extraction Name: ID: Q1. Give three criteria for a good extraction solvent. Q2. Write a balanced chemical equation for the acid-base reactions involved in this experiment. Q3. Which is the bottom phase in a water/methylene chloride (d=1.325) system? Briefly explain your predictions

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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EXTRACTION SEPARATION OF BENZOIC ACID FROM A MIXTURE OF BENZOIC ACID AND NAPHTHALENE

12 of 78 EXPERIMENTAL PROCEDURE: 1. Weigh to two decimal places, about 2 g of the mixture of benzoic acid and naphthalene and transfer it to a 100 mL conical flask. Record the mass, accurately, in the results report. 2. Add about 40 mL of ethyl acetate (an organic solvent) into the conical flask and shake it gently until all the solid has dissolved. 3. Make sure that the tap of a separating funnel is closed. Pour the solution into the separating funnel. Separating Funnel Figure 1 4. Add approximately 20 mL of 2M NaOH, place the stopper onto the separating funnel and hold the separating funnel with both hands. Turn the funnel upside down and shake it pointing the stem away from other students. Vent the funnel to release the pressure after shaking by holding on to the stopper securely and slowly opening the tap. Repeat the shaking and venting process few more times until the sound of the vapors released is no longer audible. 5. Clamp the separating funnel on a stand, remove the stopper and let the layers separate. After the layers have separated, run off the lower (aqueous) layer into a 250 mL beaker. 6. Repeat steps 4-5 with another 20 mL portion of 2M NaOH, and add the lower layer to the extract in the beaker. The benzoic acid (in form of a salt, benzoate) has now been 12
Transcribed Image Text:12 of 78 EXPERIMENTAL PROCEDURE: 1. Weigh to two decimal places, about 2 g of the mixture of benzoic acid and naphthalene and transfer it to a 100 mL conical flask. Record the mass, accurately, in the results report. 2. Add about 40 mL of ethyl acetate (an organic solvent) into the conical flask and shake it gently until all the solid has dissolved. 3. Make sure that the tap of a separating funnel is closed. Pour the solution into the separating funnel. Separating Funnel Figure 1 4. Add approximately 20 mL of 2M NaOH, place the stopper onto the separating funnel and hold the separating funnel with both hands. Turn the funnel upside down and shake it pointing the stem away from other students. Vent the funnel to release the pressure after shaking by holding on to the stopper securely and slowly opening the tap. Repeat the shaking and venting process few more times until the sound of the vapors released is no longer audible. 5. Clamp the separating funnel on a stand, remove the stopper and let the layers separate. After the layers have separated, run off the lower (aqueous) layer into a 250 mL beaker. 6. Repeat steps 4-5 with another 20 mL portion of 2M NaOH, and add the lower layer to the extract in the beaker. The benzoic acid (in form of a salt, benzoate) has now been 12
CHEM3322 EXPERIMENT 3: Extraction Name: ID: Q1. Give three criteria for a good extraction solvent. Q2. Write a balanced chemical equation for the acid-base reactions involved in this experiment. Q3. Which is the bottom phase in a water/methylene chloride (d=1.325) system? Briefly explain your predictions
Transcribed Image Text:CHEM3322 EXPERIMENT 3: Extraction Name: ID: Q1. Give three criteria for a good extraction solvent. Q2. Write a balanced chemical equation for the acid-base reactions involved in this experiment. Q3. Which is the bottom phase in a water/methylene chloride (d=1.325) system? Briefly explain your predictions
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