Homework Answers
7) In the synthesis of aspirin, equimolar amount of acetic anhydride and salicylic acid is used but if more than equimolar amount of acetic anhydride is used then acetic anhydride is in excess. Thus excess acetic anhydride hydrolyzed to acetic acid during work up and get dissolve in water whereas aspirin separate out as product because it is insoluble in water. Hence, excess acetic anhydride is removed.
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aspirin experiment
7. Acetic anhydride was used in excess in this experiment. What does...
What does anhydride mean? What would happen to the acetic anhydride if water was present in...
What does anhydride mean? What would happen to the acetic anhydride if water was present in the reaction mixture? How would this affect the yield of the aspirin reaction? 1.
5. Iron(III) ions are used as a qualitative test for phenols (aromatic compounds containing an-OH functional group)...
5. Iron(III) ions are used as a qualitative test for phenols (aromatic compounds containing an-OH functional group). (1 point) a. What compound was used as a positive control for the Fe3+ test in this experiment? b. Did the reaction product give a positive or negative test with Fe3+ ions? Explain. 6. Acetic anhydride was used in excess in this experiment. What does this mean, and how was the excess acetic anhydride decomposed at the end of the reaction? (1 point)
Suppose you started with 25.8 g of salicylic acid and an excess of acetic anhydride was...
Suppose you started with 25.8 g of salicylic acid and an excess of acetic anhydride was used to synthesize aspirin. If you obtained 21.7 g of aspirin, calculate the yield of this reaction. (Show your detailed calculations) (1.5 Points) 3. After carrying out the aspirin synthesis experiment, suggest two experiments or techniques (give only name of Experiment) based on what you have learned last few weeks to confirm the preparation and purity of aspirin. (1 Point) 4. A commercial aspirin...
2. Suppose you started with 25.8 g of salicylic acid and an excess of acetic anhydride...
2. Suppose you started with 25.8 g of salicylic acid and an excess of acetic anhydride was used to synthesize aspirin. If you obtained 21.7 g of aspirin, calculate the yield of this reaction. (Show your detailed calculations) (1.5 Points) 3. After carrying out the aspirin synthesis experiment, suggest two experiments or techniques (give only name of Experiment) based on what you have learned last few weeks to confirm the preparation and purity of aspirin. (1 Point) 4. A commercial...
someone help me with these 7 questions add a drop of iodine solution. If starch is present, I Wl iodine. The starch...
someone help me with these 7 questions
add a drop of iodine solution. If starch is present, I Wl iodine. The starch-iodine complex is deep blue-violet. Repeat this test with a com- mercial aspirin tablet and with the acetylsalicylic acid prepared in this experiment O N S at is the purpose of the concentrated phosphoric acid used in the first step? What would happen if the phosphoric acid were left out? 2. 1. Wh 3. If you used 250 mg...
1) Which reactant, salicylic acid or acetic anhydride, is in excess? Show your work. 2) If you we...
1) Which reactant, salicylic acid or acetic anhydride, is in
excess? Show your work.
2) If you were to use 3.17 g of starting material, how much
product would you expect? Again, show your work.
3) Why is phosphoric acid added to the reaction?
4) A small amount of water is added at the end of the reaction
to react with the excess acetic anhydride. Show a balanced equation
for that reaction.
5) Explain the purpose of the FeCl3 test...
Experiment 11: Synthesis of Aspirin pre-lab (4 pts) 1) (2 pts) Refer to the introduction on...
Experiment 11: Synthesis of Aspirin pre-lab (4 pts) 1) (2 pts) Refer to the introduction on interpreting the ferric chloride test for phenols. Two students performed the aspirin synthesis experiment. Their melting point and ferric chloride test data are shown below. Based on the results, which student's aspirin has the higher purity? Justify your choice using the melting point data and ferric chloride test results. Melting point range for pure aspirin = 136-140 °C. Melting point range (°C) Ferric chloride...
Student Name: ID#: Date: EXPERIMENT 3 - PREPARATION OF ASPIRIN PRE - LABORATORY ASSESSMENT 1. Could...
Student Name: ID#: Date: EXPERIMENT 3 - PREPARATION OF ASPIRIN PRE - LABORATORY ASSESSMENT 1. Could you have used acetyl bromide (CH3COOBr) instead of acetic anhydride in this reaction? Explain. Draw a diagram showing any intermolecular hydrogen bonds possible in the product molecule? ID: Date: Student Name EXPERIMENT 3 - PREPARATION OF ASPIRIN PRE - LABORATORY ASSESSMENT 1. Could you have used acetyl bromide (CH3COOB) instead of acetic anhydride in this reaction? Explain. 2. Draw a diagram showing any intermolecular...
Preparation of Aspirin Name Class & Section PRE-LABORATORY ASSIGNMENT 1. What hazards should you be aware of wh...
Preparation of Aspirin Name Class & Section PRE-LABORATORY ASSIGNMENT 1. What hazards should you be aware of when working with the following chemicals? a. Acetic anhydride b. Concentrated sulfuric acid 2. Explain the following terms as they relate to this experiment. a. Catalyst b. Limiting reactant 3. Following the procedure described in this experiment, a student reacted 2.775 g of salicylic acid with 4.0 ml of acetic anhydride and recovered 2.986 g of aspirin. a. Calculate the number of moles...
QUESTION 3 Salicylic acid reacts with acetic anhydride to form aspirin and acetic acid as shown. Use the equation to answer Questions 3 – 6. (salicylic acid) ...
QUESTION 3 Salicylic acid reacts with acetic anhydride to form aspirin and acetic acid as shown. Use the equation to answer Questions 3 – 6. (salicylic acid) (aspirin) C7H6O3 (s) + C4H6O3 (l) → C9H8O4 (s) + CH3COOH (l) MM = 138 MM = 180 If we divide 180 by 138 we find that 1.00 g salicylic acid will produce a maximum of 1.30 g aspirin. 3. A student starts with 3.20 g salicylic acid. What is the maximum amount...
What does anhydride mean? What would happen to the acetic anhydride if water was present in the reaction mixture? How would this affect the yield of the aspirin reaction? 1.
5. Iron(III) ions are used as a qualitative test for phenols (aromatic compounds containing an-OH functional group). (1 point) a. What compound was used as a positive control for the Fe3+ test in this experiment? b. Did the reaction product give a positive or negative test with Fe3+ ions? Explain. 6. Acetic anhydride was used in excess in this experiment. What does this mean, and how was the excess acetic anhydride decomposed at the end of the reaction? (1 point)
someone help me with these 7 questions
add a drop of iodine solution. If starch is present, I Wl iodine. The starch-iodine complex is deep blue-violet. Repeat this test with a com- mercial aspirin tablet and with the acetylsalicylic acid prepared in this experiment O N S at is the purpose of the concentrated phosphoric acid used in the first step? What would happen if the phosphoric acid were left out? 2. 1. Wh 3. If you used 250 mg...
1) Which reactant, salicylic acid or acetic anhydride, is in
excess? Show your work.
2) If you were to use 3.17 g of starting material, how much
product would you expect? Again, show your work.
3) Why is phosphoric acid added to the reaction?
4) A small amount of water is added at the end of the reaction
to react with the excess acetic anhydride. Show a balanced equation
for that reaction.
5) Explain the purpose of the FeCl3 test...
Experiment 11: Synthesis of Aspirin pre-lab (4 pts) 1) (2 pts) Refer to the introduction on interpreting the ferric chloride test for phenols. Two students performed the aspirin synthesis experiment. Their melting point and ferric chloride test data are shown below. Based on the results, which student's aspirin has the higher purity? Justify your choice using the melting point data and ferric chloride test results. Melting point range for pure aspirin = 136-140 °C. Melting point range (°C) Ferric chloride...
Student Name: ID#: Date: EXPERIMENT 3 - PREPARATION OF ASPIRIN PRE - LABORATORY ASSESSMENT 1. Could you have used acetyl bromide (CH3COOBr) instead of acetic anhydride in this reaction? Explain. Draw a diagram showing any intermolecular hydrogen bonds possible in the product molecule? ID: Date: Student Name EXPERIMENT 3 - PREPARATION OF ASPIRIN PRE - LABORATORY ASSESSMENT 1. Could you have used acetyl bromide (CH3COOB) instead of acetic anhydride in this reaction? Explain. 2. Draw a diagram showing any intermolecular...
Preparation of Aspirin Name Class & Section PRE-LABORATORY ASSIGNMENT 1. What hazards should you be aware of when working with the following chemicals? a. Acetic anhydride b. Concentrated sulfuric acid 2. Explain the following terms as they relate to this experiment. a. Catalyst b. Limiting reactant 3. Following the procedure described in this experiment, a student reacted 2.775 g of salicylic acid with 4.0 ml of acetic anhydride and recovered 2.986 g of aspirin. a. Calculate the number of moles...
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