17. You are testing solvents for recrystallization and find that your crude material dissolves in hot...
17. You are testing solvents for recrystallization and find that your crude material dissolves in hot ethyl acetate, hexane, and toluene and it crystallizes from toluene and hexane upon cooling. Which solvent should you use?
a. ethyl acetate
b. hexane
c. toluene
Homework Answers
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17. You are testing solvents for recrystallization and find that
your crude material dissolves in hot...
number 3 P u Purpose lule TOTTOwing in this exptum a. using hot filtration b. not...
number 3
P u Purpose lule TOTTOwing in this exptum a. using hot filtration b. not cooling (chilling) the hot filtered solution immediately c. washing the crystals in the final step with ice cold water d. using gravity filtration (not vacuum filtration) in the hot filtratio step e. using a stemless funnel in the hot filtration step. 2. What are the requirements for a good recrystallizing solvent. 3. Using the data of Table 6.1, compare the following pairs of liquids...
Benzydrol will be recrystallized from hexane during this experiment. Please identify the following statements about recrystallization...
Benzydrol will be recrystallized from hexane during this experiment. Please identify the following statements about recrystallization as true or false. Select all that are True. 1 Start heating the flask with just enough solvent in the flask to cover the sample. 2 When you collect your crystals you can wash them with a small amount of the recrystallization solvent, but you should cool the solvent down in an ice bath before using it. 3 If you are short on time,...
The student loads the solid onto a column, prepacked with silica gel, and elutes the column...
The student loads the solid onto a column, prepacked with silica gel, and elutes the column with an appropriate solvent system to allow the components to be completed separated. 11. Based on your understanding of column chromatography, which of the following solvent systems is most likely to yield the best separation of the two components in this mixture? Please explain your answer BRIEFLY (5 pts)! The ranking of solvent polarity is: MeOH>ethyl acetate> hexane (ie, MeOH is the most polar)....
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...
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...
a) Why do you use a minimum of hot water solvent in carrying out a recrystallization...
a) Why do you use a minimum of hot water solvent in carrying out a recrystallization of a particular compound? b) Why is it desirable to use suction filtration rather than gravimetric filtration in recovering the purified crystals? c) Why should the suction be released before the solid is washed with fresh solvent?
3) Assume that you are given a mixture of compound A and compound B, and it...
3) Assume that you are given a mixture of compound A and compound B, and it is your job to separate them. You are also given the following table of information. a. Describe in detail how you would separate these two compounds. Tell what solvent or solvents you would use, and explain your choice(s). R, in pure ethyl acetate 0.90 0.80 R, in 100% hexane R, in 50% ethyl Compound A 0.70 opoB 0.05 acetate in hexane 0.85 0.50 b....
(4pts) When you perform a liquid-liquid ext 17) which of the following organic solvent is on...
(4pts) When you perform a liquid-liquid ext 17) which of the following organic solvent is on the bottoming a extraction us which is on top? (write your answer by the solvent name p a) Ethyl acetate b) hexane c) Dichloromethane d) diethyl ether a liquid-liquid extraction and you have a 18) (3pts) If you are performing carboxylic acid and a non-acidic compound, which combinat you use for the separation? of solvents a) dichloromethane/HCI b) dichloromethane/methanol c) dicholoromethane/NaOH d) NaOH and...
1)When you perform a liquid-liquid extraction using a separatory funnel, which of the following organic solvent...
1)When you perform a liquid-liquid extraction using a separatory funnel, which of the following organic solvent is on the bottom of the aqueous phase and which is on top? (write your answer by the solvent name) a) Ethyl acetate b) hexane c) Dichloromethane d) diethyl ether 2) If you are performing a liquid-liquid extraction and you have a mix of a carboxylic acid and a non-acidic compound, which combination of solvents would you use for the separation? a) dichloromethane/HCI b)...
A. Recrystallization is an important technique that we used in this lab to purify solids. Answer...
A. Recrystallization is an important technique that we used in this lab to purify solids. Answer the following questions related to this technique, which is outlined in the diagram below. (2 pts. each) Watch ass Watch Glass Hot solvent Insoluble mpurities Dissolve the compound Continue heating if necessary hot solvent Fluted fiter paper Continue heating until half of the solvent is evaporated Vacuum filtration Allowed to cool to room temperature then put in an ice bath HOT Gravity filtration 3....
number 3
P u Purpose lule TOTTOwing in this exptum a. using hot filtration b. not cooling (chilling) the hot filtered solution immediately c. washing the crystals in the final step with ice cold water d. using gravity filtration (not vacuum filtration) in the hot filtratio step e. using a stemless funnel in the hot filtration step. 2. What are the requirements for a good recrystallizing solvent. 3. Using the data of Table 6.1, compare the following pairs of liquids...
The student loads the solid onto a column, prepacked with silica gel, and elutes the column with an appropriate solvent system to allow the components to be completed separated. 11. Based on your understanding of column chromatography, which of the following solvent systems is most likely to yield the best separation of the two components in this mixture? Please explain your answer BRIEFLY (5 pts)! The ranking of solvent polarity is: MeOH>ethyl acetate> hexane (ie, MeOH is the most polar)....
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...
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...
3) Assume that you are given a mixture of compound A and compound B, and it is your job to separate them. You are also given the following table of information. a. Describe in detail how you would separate these two compounds. Tell what solvent or solvents you would use, and explain your choice(s). R, in pure ethyl acetate 0.90 0.80 R, in 100% hexane R, in 50% ethyl Compound A 0.70 opoB 0.05 acetate in hexane 0.85 0.50 b....
(4pts) When you perform a liquid-liquid ext 17) which of the following organic solvent is on the bottoming a extraction us which is on top? (write your answer by the solvent name p a) Ethyl acetate b) hexane c) Dichloromethane d) diethyl ether a liquid-liquid extraction and you have a 18) (3pts) If you are performing carboxylic acid and a non-acidic compound, which combinat you use for the separation? of solvents a) dichloromethane/HCI b) dichloromethane/methanol c) dicholoromethane/NaOH d) NaOH and...
1)When you perform a liquid-liquid extraction using a separatory funnel, which of the following organic solvent is on the bottom of the aqueous phase and which is on top? (write your answer by the solvent name) a) Ethyl acetate b) hexane c) Dichloromethane d) diethyl ether 2) If you are performing a liquid-liquid extraction and you have a mix of a carboxylic acid and a non-acidic compound, which combination of solvents would you use for the separation? a) dichloromethane/HCI b)...
A. Recrystallization is an important technique that we used in this lab to purify solids. Answer the following questions related to this technique, which is outlined in the diagram below. (2 pts. each) Watch ass Watch Glass Hot solvent Insoluble mpurities Dissolve the compound Continue heating if necessary hot solvent Fluted fiter paper Continue heating until half of the solvent is evaporated Vacuum filtration Allowed to cool to room temperature then put in an ice bath HOT Gravity filtration 3....
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