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, it is okay to place the hot
recrystallization solution directly into an ice water bath.
4 A boiling aid is not required.
5 If everything in the sample dissolves in the hot solvent, it is
still necessary to carry out a hot gravity filtration to ensure a
pure final crystal.
6 During a hot gravity filtration you must use a fluted filter
paper and a stemless funnel.
7 At room temperature, slowly add solvent until all of the sample
dissolves.
Homework Answers
Add Answer to:
Benzydrol will be recrystallized from hexane during this
experiment. Please identify the following statements about
recrystallization...
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....
If crystals don’t form after the recrystallization flask is cooled in an ice bath, there is...
If crystals don’t form after the recrystallization flask is cooled in an ice bath, there is nothing more to do to gain crystals. True False Question 2 What is the recrystallization solvent for triphenylmethanol? hexanes ethanol a hexanes/ethanol mixture water Question 3 What is the theoretical yield of the product, triphenylmethanol, if 20.0 mmol of benzophenone is the limiting reagent? 3.140 g 3.644 g 5.207 g 20.0 g Question 9 When recrystallizing a solid: hot solvent should be used the...
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...
Write out your separation scheme for this experiment. 1. Heat 75 mL of water to 90...
Write out your separation scheme for this experiment. 1. Heat 75 mL of water to 90 °C in a 250-mL beaker. 2. While the water is being heated, place 250 mg of salicylic acid, 1 drop of 85% phosphoric acid and 0.5 mL of acetic anhydride in a test tube. Add a boiling chip to the mixture and gently shake it in order to mix the reactants. 3. Heat the tube in the beaker of water at 85 - 90...
Question 8 Status: Not yet answered Points possible: 1.00 During a recrystallization, the goal is to...
Question 8 Status: Not yet answered Points possible: 1.00 During a recrystallization, the goal is to form purified crystals of a solid out of solution. However, you might form an oil instead. How should you respond if an oil forms during your recrystallization? Select one: O Filter the mixture to remove the oil and continue with the recrystallization. O Use a separatory funnel and additional solvent to isolate the oil product. O Add more of the recrystallization solvent to form...
What is the limiting reagent in this experiment? Acetophenone or aqueous bleach? 1. Add about 1.0...
What is the limiting reagent in this experiment? Acetophenone or
aqueous bleach?
1. Add about 1.0 g (measured accurately) of acetophenone to 40 mL of the bleach solution (5% NaCl in water - this reactant should be included in your table of reagents!) in a 100 mL round bottom flask equipped with a magnetic stirrer. Clamp the flask in the fume hood above a stir plate. 2. After the initial reaction has subsided, boil the reaction mixture gently for 5...
Can someone tell me if a theoretical yield needs to be calculated for this experiment? And...
Can someone tell me if a theoretical yield needs to be
calculated for this experiment? And if so, how do you calculate it?
please show all work. thank you. btw the aniline weighs
6.69g.
Synthesis of Acetanilide Acetanilide is synthesized from aniline by a reaction known as acylation. Acylation is the addition of an acyl group to a compound. In this experiment, aniline (1 amine) is reacted with acetic anhydride (acylating agent) to form acetanilide (an amide). H-C-CH3 + CH...
Running the Reaction Add 0.100 g benzil and 0.30 mL 95% ethanol to a 3-mL conical vial. Place a s...
Determine the theoretical yield and limiting reagent
Running the Reaction Add 0.100 g benzil and 0.30 mL 95% ethanol to a 3-mL conical vial. Place a spin vane in the vial and attach an air condenser. Heat the mixture with an aluminum block (90-100°C) while stirring until the benzil has dissolved (see inset in Tech- nique 6, Figure 6.1A). Using a 9-inch Pasteur pipette, add dropwise 0.25 mL of an aqueous potassium hydroxide solution' downward through the condenser into the...
How does the acetone destroy the unreacted hypochlorite? 1. Add about 1.0 g (measured accurately) of...
How does the acetone destroy
the unreacted hypochlorite?
1. Add about 1.0 g (measured accurately) of acetophenone to 40 mL of the bleach solution (5% NaCl in water - this reactant should be included in your table of reagents!) in a 100 mL round bottom flask equipped with a magnetic stirrer. Clamp the flask in the fume hood above a stir plate. 2. After the initial reaction has subsided, boil the reaction mixture gently for 5 - 10 minutes using...
What is the mechanism (with curved arrows) for this reaction? 1. Add about 1.0 g (measured accurately) of acetophenone t...
What is the mechanism (with
curved arrows) for this reaction?
1. Add about 1.0 g (measured accurately) of acetophenone to 40 mL of the bleach solution (5% NaCl in water - this reactant should be included in your table of reagents!) in a 100 mL round bottom flask equipped with a magnetic stirrer. Clamp the flask in the fume hood above a stir plate. 2. After the initial reaction has subsided, boil the reaction mixture gently for 5 - 10...
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....
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...
Question 8 Status: Not yet answered Points possible: 1.00 During a recrystallization, the goal is to form purified crystals of a solid out of solution. However, you might form an oil instead. How should you respond if an oil forms during your recrystallization? Select one: O Filter the mixture to remove the oil and continue with the recrystallization. O Use a separatory funnel and additional solvent to isolate the oil product. O Add more of the recrystallization solvent to form...
What is the limiting reagent in this experiment? Acetophenone or
aqueous bleach?
1. Add about 1.0 g (measured accurately) of acetophenone to 40 mL of the bleach solution (5% NaCl in water - this reactant should be included in your table of reagents!) in a 100 mL round bottom flask equipped with a magnetic stirrer. Clamp the flask in the fume hood above a stir plate. 2. After the initial reaction has subsided, boil the reaction mixture gently for 5...
Can someone tell me if a theoretical yield needs to be
calculated for this experiment? And if so, how do you calculate it?
please show all work. thank you. btw the aniline weighs
6.69g.
Synthesis of Acetanilide Acetanilide is synthesized from aniline by a reaction known as acylation. Acylation is the addition of an acyl group to a compound. In this experiment, aniline (1 amine) is reacted with acetic anhydride (acylating agent) to form acetanilide (an amide). H-C-CH3 + CH...
Determine the theoretical yield and limiting reagent
Running the Reaction Add 0.100 g benzil and 0.30 mL 95% ethanol to a 3-mL conical vial. Place a spin vane in the vial and attach an air condenser. Heat the mixture with an aluminum block (90-100°C) while stirring until the benzil has dissolved (see inset in Tech- nique 6, Figure 6.1A). Using a 9-inch Pasteur pipette, add dropwise 0.25 mL of an aqueous potassium hydroxide solution' downward through the condenser into the...
How does the acetone destroy
the unreacted hypochlorite?
1. Add about 1.0 g (measured accurately) of acetophenone to 40 mL of the bleach solution (5% NaCl in water - this reactant should be included in your table of reagents!) in a 100 mL round bottom flask equipped with a magnetic stirrer. Clamp the flask in the fume hood above a stir plate. 2. After the initial reaction has subsided, boil the reaction mixture gently for 5 - 10 minutes using...
What is the mechanism (with
curved arrows) for this reaction?
1. Add about 1.0 g (measured accurately) of acetophenone to 40 mL of the bleach solution (5% NaCl in water - this reactant should be included in your table of reagents!) in a 100 mL round bottom flask equipped with a magnetic stirrer. Clamp the flask in the fume hood above a stir plate. 2. After the initial reaction has subsided, boil the reaction mixture gently for 5 - 10...
Most questions answered within 3 hours.
-
Calculate the specific heat of a certain unknown metal, if it
requires 195 joules of heat...
asked 6 minutes ago -
Identify the characteristics of a successful
project.
Describe the phases the project lifecycle.
Define the roles...
asked 15 minutes ago -
1. In Module 2 "headers" and "footers" are
described. Explain the difference between them and how...
asked 10 minutes ago -
Three polarizing filters are stacked with the polarizing axes of
the second and third at 58.5...
asked 19 minutes ago -
The capacitance in a series RCL circuit is C1 = 3.3 μF, and
the corresponding resonant...
asked 29 minutes ago -
A 357.7-gram sample of an unknown substance (MM = 92.41 g/mol)
is heated from -23.1 °C...
asked 28 minutes ago -
The project aims to design a network for a casino. The casino
has 10 floors including...
asked 33 minutes ago -
Combustion of an unknown compound containing only carbon and
hydrogen produces 54.9 g of CO₂ and...
asked 49 minutes ago -
A basketball player achieves a hang time, the total time of
flight, of 0.748 s when...
asked 49 minutes ago -
A processor of carrots cuts the green top off each carrot,
washes the carrots, and inserts...
asked 1 hour ago -
Please help me find the coefficient of kinetic and static
friction of two masses (500kg and...
asked 58 minutes ago -
Stanley Department Stores reported net income of $815,000 for
the year ended December 31, 2018.
Additional...
asked 1 hour ago