Homework Answers
The melting point of any substance gets significantly lowered if there is any impurity present in it other than moisture.In case of aspirin, the reactant salicylic acid is procured from a source. There are chances if the salicylic acid contains any impurities then it can also affect the production, composition and properties of final product. Similar might be the case for melting point of aspirin which must have got lowered due to the impurity present in it which was carried along by salicylic acid from the beginning of reaction.
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The major reason why the melting point of your aspirin was below the reported value of...
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...
DATA Part A: Synthesis of Aspirin Mass of salicylic acid Mass of watch glass Mass of...
DATA Part A: Synthesis of Aspirin Mass of salicylic acid Mass of watch glass Mass of watch glass + dry product Calculated mass of dry product Melting range of product Addition of FeCl, to salicylic acid Addition of FeCl, to product Theoretical yield of aspirin Show calculation: Percent yield of aspina product Show calculation: Lab 9 . Formation o Section LAB 9 REFLECTIVE EXERCISES Date 1 What data did you collect to indicate that you successfully produced aspirn? What did...
Recrystallization: Percent error of melting point and how impurities affect melting point: Please explain both questions...
Recrystallization: Percent error of melting point and
how impurities affect melting point:
Please explain both questions below:
(Part A) During a recrystallization experiment, the literature melting point of a compound is 105-107 °C. The melting point temperature you obtain from your recrystallized compound is 103-105 °C. Which of the following would be the proper way to set up the percent error of your mp? (a) (104/106)*100 (b) [(106-104)/106] *100 (c) (107/105)*100 (d) [(107-105)/107] *100 (Part B) For a recrystallization experiment...
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...
Question 16 For which molecule below, the melting point was reported wrong by student? 5 pts...
Question 16 For which molecule below, the melting point was reported wrong by student? 5 pts Compound A) Naphthalene B) Benzophenone C) D-Anisic acid D) 3-Chlorobenzoic Observed MP 79-80° 45-47° 178-182 acid 157 Question 17 5 pts
- A student is trying to identify an unknown solid based on its melting point. She...
- A student is trying to identify an unknown solid based on its melting point. She noted that the compound began to melt at 182°C and finished melting at 187°C. Knowing it is possible for there to be impurities in the sample, is this compound more likely to be camphor or hydroquinone. Explain your reasoning. A young chemist has synthesized what he believed to be acetaminophen. He measured the melting point of this newly formed compound to be 163-178°C. If...
Question 14 The melting point of a pure compound is known to be 110-111º. Describe the...
Question 14 The melting point of a pure compound is known to be 110-111º. Describe the melting behavior expected if this compound is contaminated with 5% of an impurity. 90-96 111-113 90-91 110-111 5 pts Question 15 You and your lab partner take melting points of the same sample. You observe a melting point of 101-107°C, while your partner observes a value of 110-112°C. Explain how you can get two different values with exactly the same sample. One of the...
Provide a brief rationale for why ( Please help me answer all questions please this is SO important) When benzoic acid is mixed with inorganic sand, what happens to the melting point of the sa...
Provide a brief rationale for why
( Please help me answer all questions please this is SO
important)
When benzoic acid is mixed with inorganic sand, what happens to the melting point of the sample? 6. a. It increases b. It decreases c. It stays the same. d. It increases above the actual melting point then decreases. e. It goes below the eutectic point 7. In thin-layer chromatography, the observed Rr will change upon changing any of the following parameters...
(1 point) Select the FIRST correct reason why the given series diverges. A. Diverges because the ...
(1 point) Select the FIRST correct reason why the given series diverges. A. Diverges because the terms don't have limit zero B. Divergent geometric series C. Divergent p series D. Integral test E. Comparison with a divergent p series F Diverges by limit comparison test G. Diverges by alternating series test 1. 2. n ln(n) cos(nT) In(4) 02n 3 (n182 +1)" 2n
(1 point) Select the FIRST correct reason why the given series diverges. A. Diverges because the terms don't...
1. Using Sigma-Aldrich website or Merck Index website or Google search find and draw structures for...
1. Using Sigma-Aldrich website or Merck Index website or Google search find and draw structures for the following compounds. (a) Atropine (b) Hydroxychloroquine (c) Saccharin (d) Cholesterol (e) Vitamin C (ascorbic acid) 2. Find the melting points for the following compounds by using Sigma-Aldrich or Google search (a) Biphenyl (b) 4-bromobenzoic acid (C) 3-nitrophenol 9. Chlorine, bromine and iodine all react with alkenes such as ethene in an addition reaction (a) Write the equation for the bromination of ethene, and...
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...
DATA Part A: Synthesis of Aspirin Mass of salicylic acid Mass of watch glass Mass of watch glass + dry product Calculated mass of dry product Melting range of product Addition of FeCl, to salicylic acid Addition of FeCl, to product Theoretical yield of aspirin Show calculation: Percent yield of aspina product Show calculation: Lab 9 . Formation o Section LAB 9 REFLECTIVE EXERCISES Date 1 What data did you collect to indicate that you successfully produced aspirn? What did...
Recrystallization: Percent error of melting point and
how impurities affect melting point:
Please explain both questions below:
(Part A) During a recrystallization experiment, the literature melting point of a compound is 105-107 °C. The melting point temperature you obtain from your recrystallized compound is 103-105 °C. Which of the following would be the proper way to set up the percent error of your mp? (a) (104/106)*100 (b) [(106-104)/106] *100 (c) (107/105)*100 (d) [(107-105)/107] *100 (Part B) For a recrystallization experiment...
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...
Question 16 For which molecule below, the melting point was reported wrong by student? 5 pts Compound A) Naphthalene B) Benzophenone C) D-Anisic acid D) 3-Chlorobenzoic Observed MP 79-80° 45-47° 178-182 acid 157 Question 17 5 pts
- A student is trying to identify an unknown solid based on its melting point. She noted that the compound began to melt at 182°C and finished melting at 187°C. Knowing it is possible for there to be impurities in the sample, is this compound more likely to be camphor or hydroquinone. Explain your reasoning. A young chemist has synthesized what he believed to be acetaminophen. He measured the melting point of this newly formed compound to be 163-178°C. If...
Question 14 The melting point of a pure compound is known to be 110-111º. Describe the melting behavior expected if this compound is contaminated with 5% of an impurity. 90-96 111-113 90-91 110-111 5 pts Question 15 You and your lab partner take melting points of the same sample. You observe a melting point of 101-107°C, while your partner observes a value of 110-112°C. Explain how you can get two different values with exactly the same sample. One of the...
Provide a brief rationale for why
( Please help me answer all questions please this is SO
important)
When benzoic acid is mixed with inorganic sand, what happens to the melting point of the sample? 6. a. It increases b. It decreases c. It stays the same. d. It increases above the actual melting point then decreases. e. It goes below the eutectic point 7. In thin-layer chromatography, the observed Rr will change upon changing any of the following parameters...
(1 point) Select the FIRST correct reason why the given series diverges. A. Diverges because the terms don't have limit zero B. Divergent geometric series C. Divergent p series D. Integral test E. Comparison with a divergent p series F Diverges by limit comparison test G. Diverges by alternating series test 1. 2. n ln(n) cos(nT) In(4) 02n 3 (n182 +1)" 2n
(1 point) Select the FIRST correct reason why the given series diverges. A. Diverges because the terms don't...
1. Using Sigma-Aldrich website or Merck Index website or Google search find and draw structures for the following compounds. (a) Atropine (b) Hydroxychloroquine (c) Saccharin (d) Cholesterol (e) Vitamin C (ascorbic acid) 2. Find the melting points for the following compounds by using Sigma-Aldrich or Google search (a) Biphenyl (b) 4-bromobenzoic acid (C) 3-nitrophenol 9. Chlorine, bromine and iodine all react with alkenes such as ethene in an addition reaction (a) Write the equation for the bromination of ethene, and...
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