Homework Answers
Question 1.
Part 1.
Ferric chloride test can be performed to test for unreacted phenol.
Explanation: The red-colored FeCl3 reacts with phenol to give intense colored [Fe(OPh)6]3- complex ion.
Part 2.
The positive test for phenol looks like the intense-colored (red) complex-ion, as explained above.
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need help on 1,2,3,4
1. The starting material for aspirin is salicylic acid which is a...
W cepted. Please do not ask for special treatment. 1. The starting material for aspirin is...
W cepted. Please do not ask for special treatment. 1. The starting material for aspirin is salicylic acid which is a phenol • 2 pts) Which chemical test will you use to test for unrearted phenol when the aspirin sync (it's a chemical test you have used earlier in the semester) cted phenol when the aspirin synthesis is completed? • (2 pts) What does a positive test for phenol look like using this test? 2. When finding a melting point...
Pre-lab Questions: Importance A one-step preparation of aspirin from its precursor, salicylic acid, via an ester...
Pre-lab Questions:
Importance A one-step preparation of aspirin from its precursor, salicylic acid, via an ester formation illustrates one of synthetic organic chemistry's most important uses, making the drugs that treat all types of illnesses. OH HOOH Background Aspirin is a prodrug of salicylic acid, the actual active drug. A compound related to salicylic acid, salicin, was first isolated from willow bark in the mid 1700's, but willow-bark extract was used by the ancient Greeks as a treatment for pain...
PROCEDURE CAUTION!!! Nitric acid and sulfuric acid are strong and corrosive acids. For that reason, avoid...
PROCEDURE CAUTION!!! Nitric acid and sulfuric acid are strong and corrosive acids. For that reason, avoid inhaling its vapors or causing any contact with the skin or clothing. Wear your protective glasses at all times. Use the extractors to work with these acids. A. Nitration of methyl benzoate 1. Preparation of the reactants. In the extractor you will find a burette with concentrated sulfuric acid, a second burette with concentrated nitric acid, clearly identified. Familiarize yourself with the scales of...
Place 3.0 g of salicylic acid in a 125-ml Erlenmeyer flask. Carefully add, stirring constantly, 6...
Place 3.0 g of salicylic acid in a 125-ml Erlenmeyer flask. Carefully add, stirring constantly, 6 mL of acetic anhydride, followed by 10 drops of concentrated sulfuric acid. Swirl the contents of the flask so that the reactants are thoroughly mixed. Stopper the flask with a one- hole cork fitted with an inverted Pasteur pipet to prevent condensation of water in the reaction flask during heating on the steam bath. Heat the flask in a boiling-water or steam bath for...
PREPARATION OF PHARMACEUTICALS - Fischer Esterification Reactions Q: Calculate the expected mass of both methyl salicylate and aspirin assuming 100% yield. EXPERIMENT7 PREPARATION OF PHARMACEUTICALS...
PREPARATION OF PHARMACEUTICALS - Fischer Esterification
Reactions
Q: Calculate the expected mass of both methyl salicylate and
aspirin assuming 100% yield.
EXPERIMENT7 PREPARATION OF PHARMACEUTICALS Fischer Esterification Reactions Almost 2500 years ago, physicians such as Hippocrates recommended that patients chew on the bark of the willow to alleviate pain. The active ingredient in willow bark was found to be salicin, a compound made of a molecule of salicyl alcohol bonded to a p-D-glucose molecule. In the stomach, the bond between...
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...
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.
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...
please help Mustrates treat all types of ilnesses. Background Aspirin is a prodrug of salicylic acid,...
please help
Mustrates treat all types of ilnesses. Background Aspirin is a prodrug of salicylic acid, the actual active drug. A compound related to salicylic acid, salicin, was first isolated from willow bark in the mid 1700's, but willow-bark extract was used by the andient Greeks as a treatment for pain and fever. Salicylic acid (and many related phenols) are very hard on your Ho stomach, but when esterified, as aspirin is, they are much better tolerated. Simple esters are...
Experiment 2: Synthesis of Aspirin (Acetylsalicylic Acid ) 1. How many moles of salicylic acid are...
Experiment 2: Synthesis of Aspirin (Acetylsalicylic Acid ) 1. How many moles of salicylic acid are there in 1.0 grams of salicylic acid? 2. How many moles of acetic anhydride are there in 3 mL of acetic anhydride? 3. When 1.0g of salicylic acid and 3 mL of acetic anhydride react, DETERMINE which one is the limiting reactant (you can go to General Chemistry if you need help about limiting reagent)? 4. What is phosphoric acid used for in the...
W cepted. Please do not ask for special treatment. 1. The starting material for aspirin is salicylic acid which is a phenol • 2 pts) Which chemical test will you use to test for unrearted phenol when the aspirin sync (it's a chemical test you have used earlier in the semester) cted phenol when the aspirin synthesis is completed? • (2 pts) What does a positive test for phenol look like using this test? 2. When finding a melting point...
Pre-lab Questions:
Importance A one-step preparation of aspirin from its precursor, salicylic acid, via an ester formation illustrates one of synthetic organic chemistry's most important uses, making the drugs that treat all types of illnesses. OH HOOH Background Aspirin is a prodrug of salicylic acid, the actual active drug. A compound related to salicylic acid, salicin, was first isolated from willow bark in the mid 1700's, but willow-bark extract was used by the ancient Greeks as a treatment for pain...
PROCEDURE CAUTION!!! Nitric acid and sulfuric acid are strong and corrosive acids. For that reason, avoid inhaling its vapors or causing any contact with the skin or clothing. Wear your protective glasses at all times. Use the extractors to work with these acids. A. Nitration of methyl benzoate 1. Preparation of the reactants. In the extractor you will find a burette with concentrated sulfuric acid, a second burette with concentrated nitric acid, clearly identified. Familiarize yourself with the scales of...
Place 3.0 g of salicylic acid in a 125-ml Erlenmeyer flask. Carefully add, stirring constantly, 6 mL of acetic anhydride, followed by 10 drops of concentrated sulfuric acid. Swirl the contents of the flask so that the reactants are thoroughly mixed. Stopper the flask with a one- hole cork fitted with an inverted Pasteur pipet to prevent condensation of water in the reaction flask during heating on the steam bath. Heat the flask in a boiling-water or steam bath for...
PREPARATION OF PHARMACEUTICALS - Fischer Esterification
Reactions
Q: Calculate the expected mass of both methyl salicylate and
aspirin assuming 100% yield.
EXPERIMENT7 PREPARATION OF PHARMACEUTICALS Fischer Esterification Reactions Almost 2500 years ago, physicians such as Hippocrates recommended that patients chew on the bark of the willow to alleviate pain. The active ingredient in willow bark was found to be salicin, a compound made of a molecule of salicyl alcohol bonded to a p-D-glucose molecule. In the stomach, the bond between...
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...
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.
please help
Mustrates treat all types of ilnesses. Background Aspirin is a prodrug of salicylic acid, the actual active drug. A compound related to salicylic acid, salicin, was first isolated from willow bark in the mid 1700's, but willow-bark extract was used by the andient Greeks as a treatment for pain and fever. Salicylic acid (and many related phenols) are very hard on your Ho stomach, but when esterified, as aspirin is, they are much better tolerated. Simple esters are...
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