1)A student purified the acetanilide by using recrystalization experiment and he got the following results. Based...
1)A student purified the acetanilide by using recrystalization experiment and he got the following results. Based on the following results answer the questions.
Starting weight of Acetanilide: 1.324g.
Melting Point of Starting acetanilide: 98.2-105.3 degrees C.
Weight obtained after recrystalization 0.954 g.
Melting Point of recrystallized acetanilide:112.2-114.3 degrees C.
Melting point of pure acetanilide (Literature Value); 114.3 degrees C.
a) Calculate the % yeild of recrystallization experiment?
b) Explain the purity of recrystallized product?
2) How did you check the purity of acetanilide at the end of the experiment? Was your product pure, Explain your judgement?
Homework Answers
Recrystallization of crude acetanilide
a) % yield of recrystallization = 0.954 g x 100/1.324 g =
b) The recrystallized acetanilide is having higher purity than the starting material. Purity of the material is defined by the percentage of impurity present in it. Acetanilide at the beginnning had much higher percentage of impurity in it, which lowered the melting point of the material and we got a wide range for the melting point. The recrystallized product having very low or almost no impurity left in it, gave a much sharp melting point compared to the starting material.
c) The purity of the recrystallized acetanilide was checked by melting point determination. The product showed a sharp melting point which is close to the reported melting point in the literature and therefore the material is pure.
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1)A student purified the
acetanilide by using recrystalization experiment and he got the
following results. Based...
please answer all parts I am trying to check my answers. Recrystallization of Acetanilide Recrystallization is...
please answer all parts I am trying to check my
answers.
Recrystallization of Acetanilide Recrystallization is an important method used by chemists to purify solid compounds. When a chemist conducts a chemical reaction as shown in Scheme 1, it will rarely go to 100% completion, and will frequently produce byproducts. These byproducts and some of the unreacted starting materials will be present in the end as impurities. Chemists need ways to remove these unwanted impurities so they can isolate their...
Please answer the following questions/fill in the data tables based on the following experiment. EXPERIMENTAL PROCEDURE:...
Please answer the following questions/fill in the data tables based on the following experiment. EXPERIMENTAL PROCEDURE: Place sodium hydroxide (2.500 g) in a 100 mL Erlenmeyer flask and add water (25.0 mL) and ethanol (20.0 mL). Add a magnetic stirrer bar and stir until all the NaOH has dissolved. To a second reaction vessel, add benzaldehyde (2.650 g, 0.025 mol) and acetone (0.725 g, 0.0125 mol). Add approximately half of the aldehyde-ketone solution to the sodium hydroxide solution, and stir...
Separating a Mixture, Recrystallization, pre-lab assignment could you also explain why you chose that substance for...
Separating a Mixture, Recrystallization, pre-lab
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could you also explain why you chose that substance for the empty
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EXPERIMENT 4 Pre-Lab Assignment Separating a Mixture, Recrystalliration Name Date 1. Complete the following flowchart which shows how to separate a mixture of sand, sodium chloride and acetanilide. Notice that after a separation process (a down arrow) the filtered solids are shown on the left and the filtrate (the liquid) is shown on the right. The terminal step...
Part A of experiment: Working in the fume hood, combine 4.0 mL of 10% NaOH solution and 4 mL EtOH in a 50 mL round bot...
Part A of experiment:
Working in the fume hood, combine 4.0 mL of 10% NaOH solution
and 4 mL EtOH in a 50 mL round bottom flask.
Dissolve 1.0 mL (8.6 mmol) of acetophenone into your
solution.
Add 1.0 mL (9.8 mmol) of benzaldehyde and a magnetic stir bar to
your flask. Clamp the flask
above a stir plate.
Monitor the reaction for 45 minutes by TLC. Acetophenone needs
to be diluted prior to TLC, and
cannot be spotted neat....
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Page 1 Synthesis using Carbonyl O-Substitution Chemistry Preamble This experiment involves the synthesis of target molecules using a-substitution chemistry. You are assigned two target molecules, one of which is best synthesized by an alkylation approach, while the other is best synthesized by an addition or condensation approach. You must do the following: 1. Perform a retrosynthetic analysis on the two target molecules assigned to you. In each case the organic starting material (what you have to work backwards toward) depends...
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Synthesis using Carbonyla-Substitution Chemistry Preamble This experiment involves the synthesis of target molecules using a-substitution chemistry. You are assigned two target molecules, one of which is best synthesized by an alkylation approach, while the other is best synthesized by an addition or condensation approach. My two target molecules are number 2 and number 12 in the last page. You must do the following: 1. Perform a retrosynthetic analysis on the two target molecules assigned to you. In each case the...
numbers 1-3 Post-Laboratory Questions-EXP 3 Nitration of Aromatic Compounds Name: Due after completing the lab. 1....
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1st picture is the questions and the next two pictures are the experiment the questions are...
1st picture is the questions and the next two pictures are the
experiment the questions are based off of
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Post-Laboratory Questions-EXP 3 Nitration of Aromatic Compounds Name: Due after completing the lab. 1. Why is concentrated sulfuric acid employed in this reaction? What is the electrophile that is produced by the reaction of sulfuric acid and nitric acid? 2. Why is it important to maintain the reaction temperature low and the addition of nitric acid-sulfuric acid mixture carried out slowly? 3. Explain why concentrated H2SO, not concentrated HCl, was used in this experiment? 4. Which ring of...
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please answer the prelab excercise:) I tried doing it but I did not
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please answer all parts I am trying to check my
answers.
Recrystallization of Acetanilide Recrystallization is an important method used by chemists to purify solid compounds. When a chemist conducts a chemical reaction as shown in Scheme 1, it will rarely go to 100% completion, and will frequently produce byproducts. These byproducts and some of the unreacted starting materials will be present in the end as impurities. Chemists need ways to remove these unwanted impurities so they can isolate their...
Separating a Mixture, Recrystallization, pre-lab
assignment
could you also explain why you chose that substance for the empty
spaces and question marks
EXPERIMENT 4 Pre-Lab Assignment Separating a Mixture, Recrystalliration Name Date 1. Complete the following flowchart which shows how to separate a mixture of sand, sodium chloride and acetanilide. Notice that after a separation process (a down arrow) the filtered solids are shown on the left and the filtrate (the liquid) is shown on the right. The terminal step...
Part A of experiment:
Working in the fume hood, combine 4.0 mL of 10% NaOH solution
and 4 mL EtOH in a 50 mL round bottom flask.
Dissolve 1.0 mL (8.6 mmol) of acetophenone into your
solution.
Add 1.0 mL (9.8 mmol) of benzaldehyde and a magnetic stir bar to
your flask. Clamp the flask
above a stir plate.
Monitor the reaction for 45 minutes by TLC. Acetophenone needs
to be diluted prior to TLC, and
cannot be spotted neat....
Page 1 Synthesis using Carbonyl O-Substitution Chemistry Preamble This experiment involves the synthesis of target molecules using a-substitution chemistry. You are assigned two target molecules, one of which is best synthesized by an alkylation approach, while the other is best synthesized by an addition or condensation approach. You must do the following: 1. Perform a retrosynthetic analysis on the two target molecules assigned to you. In each case the organic starting material (what you have to work backwards toward) depends...
Synthesis using Carbonyla-Substitution Chemistry Preamble This experiment involves the synthesis of target molecules using a-substitution chemistry. You are assigned two target molecules, one of which is best synthesized by an alkylation approach, while the other is best synthesized by an addition or condensation approach. My two target molecules are number 2 and number 12 in the last page. You must do the following: 1. Perform a retrosynthetic analysis on the two target molecules assigned to you. In each case the...
numbers 1-3
Post-Laboratory Questions-EXP 3 Nitration of Aromatic Compounds Name: Due after completing the lab. 1. Why is concentrated sulfuric acid emploved in thie on? What is the electrophile that is produced by the reaction of sulfuric acid and nitric acid? 2. Why is it important to maintain the reaction temperature low and the addition of nitric acid-sulfuric acid mixture carried out slowly? 3. Explain why concentrated H2SO4, not concentrated HC1, was used in this experiment? 4. Which ring of...
1st picture is the questions and the next two pictures are the
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please answer the prelab excercise:) I tried doing it but I did not
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Experiment 7: Grignard Reaction. Introduction Discovered by French chemist Victor Grignard, the reaction that now bears his name is an example of the preparation of an organometallic reagent. In this lab, phenylmagnesium bromide is the Grignard of interest, and it will be added to an aldehyde to produce an alcohol. Lab Objectives 1. To study organometallic reagents in general. benzophenone. 2. To prepare phenylmagnesium...
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