1) what is the benefit to performing a recrystallization to isolate a product as opposed to...
1) what is the benefit to performing a recrystallization to isolate a product as opposed to simply evaporating the solvent and recovering the product?
2) what shoul melting point always be reported as a range rather than as a single temperature?
Homework Answers
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1) what is the benefit to performing a recrystallization to
isolate a product as opposed to...
Recrystallization of Acetanilide was conducted using water as our solvent. First we had to choose a...
Recrystallization of Acetanilide was conducted using water as our solvent. First we had to choose a solvent based (water was chosen as our solvent due to it not dissolving acetanilide at room temp but dissolved it when heated) Then we performed recrystallizaation, vacuum filtration and then melting point measurements. For the post lab discussion for recrystallization of acetanilide report we have to address several different arguments. The ones below I'm not sure what to focus on to completely defend what...
Recrystallization/Melting Point 2-ethoxybenzamide is the unknown. 1. Adding enough solvent to achieve a “saturated” solution is...
Recrystallization/Melting Point 2-ethoxybenzamide is the unknown. 1. Adding enough solvent to achieve a “saturated” solution is necessary for recrystallization. a. What is the problem with adding too much solvent? b. What is the problem with adding too little solvent? 2. Why is fluted filter paper preferred over standard conical filter paper for the filtration of the recrystallized solid? 3. What is the purpose of adding boiling stones when heating solutions to a boil? 4. Name 2 requirements that must be...
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...
Okay, my answer is wrong, but what is the correct answer and why. Attempt 1 Feedback...
Okay, my answer is wrong, but what is the
correct answer and why.
Attempt 1 Feedback Select the statement that will help produce more pure crystals during recrystallization. Incorrect Seed the solution with the solid product that forms on the spatula While it is important that the solid Make sure that the solid dissolves completely in the cold solvent dissolves in hot solvent rather than Add a little extra solvent after the crystals have completely dissolved. melting, this will not...
Recrystallization Experiment Postlab Questions 1. Calculate the percent recovery of benzoic acid and aspirin. 2. What...
Recrystallization Experiment Postlab Questions 1. Calculate the percent recovery of benzoic acid and aspirin. 2. What are some of the properties of an ideal recrystallization solvent? 3. Why is ice cold solvent used to rinse the purified crystals? 4. If the hot solution were immediately placed in an ice water bath during the recrystallization process instead of first cooling to room temperature, how might this affect the results?
Extraction Q1. Why doesn’t the neutral organic compound dissolve in the 1.5 M NaOH solution? Q2....
Extraction Q1. Why doesn’t the neutral organic compound dissolve in the 1.5 M NaOH solution? Q2. Why is diethyl ether a good choice for the organic solvent in this extraction experiment? Q3. What experimental difficulty would you encounter if you neglected to include the drying step before evaporating the ether solution of the neutral organic compound? Q4. Why are the two organic compounds recrystallized before their melting points are determined? Q5. What IR bands are most useful in distinguishing a...
please provide clear answers. Thank you! 1. (8 pts) A crude reaction product (50 mg) is...
please provide clear answers.
Thank you!
1. (8 pts) A crude reaction product (50 mg) is to be purified by recrystallization from a single solvent. a) (5 pts) The crude solubility in ethanol at boiling temperature (BT) is 50 mg/mL and at O'C is 5 mg/mL. Read the statements and fill in True or False Describe in a few words the reason. True False Describe reason for true or false Statement The crude was dissolved in 5 mL of hot...
Wate anchor wro - 18,521g with and Questions: Product Suche minutes, hot nahe on 1. What product(s) do you expect t...
Wate anchor wro - 18,521g with and Questions: Product Suche minutes, hot nahe on 1. What product(s) do you expect to isolate if you nitrate phenol? Why? product 2. Why is an ice bath employed in the nitration of methyl benzoate? 3. What does the melting point range say about the identity and purity of the product? 4. Indicate the products formed and why they are formed in the nitration of benzene, toluene and benzoic acid.
Question 17 1 pts What solubility properties are important in the selection of a solvent for...
Question 17 1 pts What solubility properties are important in the selection of a solvent for recrystallisation? sparingly soluble in hot solvent and readily soluble in cold solvent readily soluble in both hot and cold solvent sparingly soluble in both hot and cold solvent readily soluble in hot solvent and sparingly soluble in cold solvent Question 18 1 pts How would you modify the procedure given in the Laboratory Manual if you did not know which solvent to use? if...
A student performs two melting-point determinations on a crystalline product. In one determination, the capillary tube...
A student performs two melting-point determinations on a crystalline product. In one determination, the capillary tube contains a sample about 1−2 mm in height and the melting range is found to be 141−142°C. In the other determination, the sample height is 4−5 mm and the melting range is found to be 141−145°C. Explain the broader melting-point range observed for the second sample. The reported melting point for the compound is 143°C. Explain what may have caused the broader melting range...
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...
Okay, my answer is wrong, but what is the
correct answer and why.
Attempt 1 Feedback Select the statement that will help produce more pure crystals during recrystallization. Incorrect Seed the solution with the solid product that forms on the spatula While it is important that the solid Make sure that the solid dissolves completely in the cold solvent dissolves in hot solvent rather than Add a little extra solvent after the crystals have completely dissolved. melting, this will not...
Recrystallization Experiment Postlab Questions 1. Calculate the percent recovery of benzoic acid and aspirin. 2. What are some of the properties of an ideal recrystallization solvent? 3. Why is ice cold solvent used to rinse the purified crystals? 4. If the hot solution were immediately placed in an ice water bath during the recrystallization process instead of first cooling to room temperature, how might this affect the results?
please provide clear answers.
Thank you!
1. (8 pts) A crude reaction product (50 mg) is to be purified by recrystallization from a single solvent. a) (5 pts) The crude solubility in ethanol at boiling temperature (BT) is 50 mg/mL and at O'C is 5 mg/mL. Read the statements and fill in True or False Describe in a few words the reason. True False Describe reason for true or false Statement The crude was dissolved in 5 mL of hot...
Wate anchor wro - 18,521g with and Questions: Product Suche minutes, hot nahe on 1. What product(s) do you expect to isolate if you nitrate phenol? Why? product 2. Why is an ice bath employed in the nitration of methyl benzoate? 3. What does the melting point range say about the identity and purity of the product? 4. Indicate the products formed and why they are formed in the nitration of benzene, toluene and benzoic acid.
Question 17 1 pts What solubility properties are important in the selection of a solvent for recrystallisation? sparingly soluble in hot solvent and readily soluble in cold solvent readily soluble in both hot and cold solvent sparingly soluble in both hot and cold solvent readily soluble in hot solvent and sparingly soluble in cold solvent Question 18 1 pts How would you modify the procedure given in the Laboratory Manual if you did not know which solvent to use? if...
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