Homework Answers
Ans a) Wash the crystals in Buchner funnel with that same solvent which is used for recrystallization to remove any impurities that may be sticking to the crystals. To dry the crystals ,leave them in the filter funnel and draw air them for several minutes.
Ans. b) your answer is quite appropriate.
Add Answer to:
4. While filtering your product on the Buchner funnel, you washed the crystals with 15 mL of cold...
Part A of experiment: Working in the fume hood, combine 4.0 mL of 10% NaOH solution and 4 mL EtOH in a 50 mL round bot...
Part A of experiment:
Working in the fume hood, combine 4.0 mL of 10% NaOH solution
and 4 mL EtOH in a 50 mL round bottom flask.
Dissolve 1.0 mL (8.6 mmol) of acetophenone into your
solution.
Add 1.0 mL (9.8 mmol) of benzaldehyde and a magnetic stir bar to
your flask. Clamp the flask
above a stir plate.
Monitor the reaction for 45 minutes by TLC. Acetophenone needs
to be diluted prior to TLC, and
cannot be spotted neat....
need help answering these questions Chemistry 2211(PRIVATE) LABORATORY PRACTICUM - 4 DO NOT CONSULT WITH OTHER...
need help answering these questions
Chemistry 2211(PRIVATE) LABORATORY PRACTICUM - 4 DO NOT CONSULT WITH OTHER LABORATORY STUDENTS, THE LABORATORY INSTRUCTOR OR GRADUATE ASSISTANT UNLESS AN ISSUE OF SAFETY, EQUIPMENT NEEDS, OR EQUIPMENT FAILURE OCCURS. You may consult your laboratory notebook or the reference books in the laboratory You may take up to 150 minutes to carry out the procedure, complete your notebook writeup on the experiment, and submit to the instructor the notebook and clearly labeled product. THE MATERIALS...
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...
Make sure the reaction table described above is completed in your notebook.
Prelab questions:1. Make sure the reaction table described above is completed in your notebook.2. Two benzaldehyde molecules combine with one acetone molecule in this aldol reaction. If someone uses 5.0 mL of benzaldehyde and 2.5 mL of acetone to try to improve the yield of product, is this the correct ratio of molecules so that there is no excess? Why or why not?The Aldol Reaction: Synthesis of DibenzalacetonePurpose: Introduce the student to the hands-on chemistry of carbonyl condensations.Warning: Dispose of...
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...
Experiment . the reduction of bencil (March 2020) Your name Sodium borohydride is a convert recent...
Experiment . the reduction of bencil (March 2020) Your name Sodium borohydride is a convert recent for the reduction of dehydes and ketones to 1" and 2 alcohols, respectively. The mechanism of the reaction - (below) is straightforward and is driven by boron's affinity for oxygen. In addition, given borohydride's remarkably low reactivity with OH groups under neutral and especially basic conditions, this reaction can be done in alcohol solvents. This means that (unlike LAH or Grignard reactions) no separate...
For the nitration of methyl benzoate: a. Which product did you get? What evidence do you...
For the nitration of methyl benzoate:
a. Which product did you get? What evidence do you have for
this?
b. Was your product pure? What evidence do you have for this?
Explain your evidence.
c. Draw the mechanism for the product you got.
For the bromination of acetanilide:
a. Which product did you get? What evidence do you have for
this?
b. Was your product pure? What evidence do you have for this?
Explain your evidence.
c. Draw the mechanism...
MSISTRY 203-204 Grganic Chemistry Lab Manual 3 4 EXPERIMENT #9 The Preparation of t Butyl Chloride A tertiary carbonium ion is more rapidly formed than a secondary or primary carbonium ion. Onc...
MSISTRY 203-204 Grganic Chemistry Lab Manual 3 4 EXPERIMENT #9 The Preparation of t Butyl Chloride A tertiary carbonium ion is more rapidly formed than a secondary or primary carbonium ion. Once formed, a tertiary carbonium ion is stabilized by charge dispersal to a greater extent than a secondary or primary carbonium ion. It therefore has a longer life expectancy. Primary carbonium ions, protons, may exist in solution only in solvated form have any free existence, they dehydration reaction and...
What are the desirable characteristics of a solvent to be used in the recrystallisation of a...
What are the desirable characteristics of a solvent to be used
in the recrystallisation of a solid product? (Hint: what is the
underlying purpose of doing recrystallisation, aside from making
the product look attractive?)
EXPERIMENT5 PREPARATION OF BENZOIC ACID Oxidation of a Primary Alcohol In this experiment, a primary alcohol (benzyl alcohol) is oxidised to a carboxylic acid (benzoic acid) by a strong oxidising agent (potassium permanganate) Because the synthesis reaction is carried out in basic conditions, the carboxylic acid...
1. Based on rhe amount of reagents, which reagent is the limiting reagent. 2. what is the struckt...
1. Based on rhe amount of reagents, which reagent is the
limiting reagent.
2. what is the struckture of B-alanine
1. Based on the amounts of reagents used in this experiment, which reagent is the limiting reagent? What is the theoretical yield (in grams) of trans-4-methoxycinnamic acid? Show all of your work. (Hint: Solvents and catalysts cannot be a limiting reagent) 2. Write a complete curved arrow mechanism for the first phase involved in the synthesis of Ho он CHyo...
Part A of experiment:
Working in the fume hood, combine 4.0 mL of 10% NaOH solution
and 4 mL EtOH in a 50 mL round bottom flask.
Dissolve 1.0 mL (8.6 mmol) of acetophenone into your
solution.
Add 1.0 mL (9.8 mmol) of benzaldehyde and a magnetic stir bar to
your flask. Clamp the flask
above a stir plate.
Monitor the reaction for 45 minutes by TLC. Acetophenone needs
to be diluted prior to TLC, and
cannot be spotted neat....
need help answering these questions
Chemistry 2211(PRIVATE) LABORATORY PRACTICUM - 4 DO NOT CONSULT WITH OTHER LABORATORY STUDENTS, THE LABORATORY INSTRUCTOR OR GRADUATE ASSISTANT UNLESS AN ISSUE OF SAFETY, EQUIPMENT NEEDS, OR EQUIPMENT FAILURE OCCURS. You may consult your laboratory notebook or the reference books in the laboratory You may take up to 150 minutes to carry out the procedure, complete your notebook writeup on the experiment, and submit to the instructor the notebook and clearly labeled product. THE MATERIALS...
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...
Experiment . the reduction of bencil (March 2020) Your name Sodium borohydride is a convert recent for the reduction of dehydes and ketones to 1" and 2 alcohols, respectively. The mechanism of the reaction - (below) is straightforward and is driven by boron's affinity for oxygen. In addition, given borohydride's remarkably low reactivity with OH groups under neutral and especially basic conditions, this reaction can be done in alcohol solvents. This means that (unlike LAH or Grignard reactions) no separate...
For the nitration of methyl benzoate:
a. Which product did you get? What evidence do you have for
this?
b. Was your product pure? What evidence do you have for this?
Explain your evidence.
c. Draw the mechanism for the product you got.
For the bromination of acetanilide:
a. Which product did you get? What evidence do you have for
this?
b. Was your product pure? What evidence do you have for this?
Explain your evidence.
c. Draw the mechanism...
MSISTRY 203-204 Grganic Chemistry Lab Manual 3 4 EXPERIMENT #9 The Preparation of t Butyl Chloride A tertiary carbonium ion is more rapidly formed than a secondary or primary carbonium ion. Once formed, a tertiary carbonium ion is stabilized by charge dispersal to a greater extent than a secondary or primary carbonium ion. It therefore has a longer life expectancy. Primary carbonium ions, protons, may exist in solution only in solvated form have any free existence, they dehydration reaction and...
What are the desirable characteristics of a solvent to be used
in the recrystallisation of a solid product? (Hint: what is the
underlying purpose of doing recrystallisation, aside from making
the product look attractive?)
EXPERIMENT5 PREPARATION OF BENZOIC ACID Oxidation of a Primary Alcohol In this experiment, a primary alcohol (benzyl alcohol) is oxidised to a carboxylic acid (benzoic acid) by a strong oxidising agent (potassium permanganate) Because the synthesis reaction is carried out in basic conditions, the carboxylic acid...
1. Based on rhe amount of reagents, which reagent is the
limiting reagent.
2. what is the struckture of B-alanine
1. Based on the amounts of reagents used in this experiment, which reagent is the limiting reagent? What is the theoretical yield (in grams) of trans-4-methoxycinnamic acid? Show all of your work. (Hint: Solvents and catalysts cannot be a limiting reagent) 2. Write a complete curved arrow mechanism for the first phase involved in the synthesis of Ho он CHyo...
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