What is the importance of the ice-cold distilled water? (Can be more than one choice) A....
What is the importance of the ice-cold distilled water? (Can be more than one choice)
| A. |
to react with the salicylic acid |
|
| B. |
to slow down the reaction |
|
| C. |
to dilute the reaction mixture |
|
| D. |
to decrease the solubility of the newly formed acetylsalicylic acid |
|
| E. |
to encourage the precipitation of the newly formed acetylsalicylic acid |
|
| F. |
to neutralize the reaction |
Homework Answers
D .Ice cold distilled water can decrease the solubility of newly formed acetylsalicylic acid .
E. It encourages the precipitation of the newly formed acetylsalicylic acid.
In aspirin preparation the following reaction occurs,
Acetic anhydride+ salicylic acid = acetylsalicylic acid + acetic acid
Here the OH of salicylic acid is acetylated and made into a less soluble product acetylsalicylic acid in water which gets then precipitated. Also reduction of solvent temperature by putting ice cold water reduces solubility of the acetylsalicylic acid and acetic acid.
Add Answer to:
What is the importance of the ice-cold distilled water? (Can be
more than one choice)
A....
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...
question 2 and 6 thabk you Exercises 1. (a) Calculate the volume of 6 M NaOH...
question 2 and 6 thabk you
Exercises 1. (a) Calculate the volume of 6 M NaOH required to react completely with the amount of methyl salicylate you used. How much of the 6 M NaOH that you used was in excess of the theoretical amount? (b) What volume of 3 M H SO is needed to neutralize all of the disodium salicylate and the excess NaOH present after the initial reaction? How much sulfuric acid was in excess? 2. Refer...
Experience teaches us that most solids are more soluble in warm water than in cold water....
Experience teaches us that most solids are more soluble in warm water than in cold water. Does the solid utility of Mg(OH)_2 fit this pattern? Briefly explain. Cobalt chloride is used in many weather-forecasting devices. Based on your observations in the laboratory, explain how an alcohol solution of CoCl_2 could be used to predict rain. A student is studying the equilibrium described by the net ionic equation shown in Equation 18. [Cu(H_2O)_6]^2+ (aq, blue) + 4 Br^-(aq) CuBr_4^2+(aq, green) +...
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...
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PREPARATION OF PHARMACEUTICALS - Fischer Esterification
Reactions
Q: Calculate the expected mass of both methyl salicylate and
aspirin assuming 100% yield.
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there is more than one question and more than one part, and i put pictures of the data in there too there...
there is more than one question and more than one part, and i put
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there is more than part and more than one picture
con Experiment 5 Data and Report Name: Charene Lab Section (Day): Wednesday Partner: Troter A. Electrolytes and Nonelectrolytes 1. Classify the substances and solutions as nonelectrolytes (lowest values), weak electrolytes middle values), or strong electrolytes highest values Important: Make sure conductivity meter is set to appropriate sensitivity range. Strong...
please identify the unknown and write a derivative Unknown compound 3 Clear liquid Physcial Properties Solubility...
please identify the unknown and write a derivative
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than other labs. These are toxicity, volatility, and flammability. We routinely use toxic organic solvents like...
than other labs. These are toxicity, volatility, and flammability. We routinely use toxic organic solvents like methanol and acetone that are volatile (have low boiling points), but even solid organic materials can produce vapors that may be toxic. Furthermore, organic materials are flammable, and solvent vapors in the air can and do produce explosive mixtures. You should take some general precautions when doing organic chemistry: Do not get solutions on your skin. You do not need to always wear gloves...
1.) What side reactions occur during the following steps. 2.) How can the IR spectrum be...
1.)
What side reactions occur during the following steps.
2.) How can the IR spectrum be used to show that there is not
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3.) Describe the major differences and similarities between
the IR spectra of benzoin and benzil. Compare your IR spectrum with
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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...
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...
question 2 and 6 thabk you
Exercises 1. (a) Calculate the volume of 6 M NaOH required to react completely with the amount of methyl salicylate you used. How much of the 6 M NaOH that you used was in excess of the theoretical amount? (b) What volume of 3 M H SO is needed to neutralize all of the disodium salicylate and the excess NaOH present after the initial reaction? How much sulfuric acid was in excess? 2. Refer...
Experience teaches us that most solids are more soluble in warm water than in cold water. Does the solid utility of Mg(OH)_2 fit this pattern? Briefly explain. Cobalt chloride is used in many weather-forecasting devices. Based on your observations in the laboratory, explain how an alcohol solution of CoCl_2 could be used to predict rain. A student is studying the equilibrium described by the net ionic equation shown in Equation 18. [Cu(H_2O)_6]^2+ (aq, blue) + 4 Br^-(aq) CuBr_4^2+(aq, green) +...
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...
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...
there is more than one question and more than one part, and i put
pictures of the data in there too
there is more than part and more than one picture
con Experiment 5 Data and Report Name: Charene Lab Section (Day): Wednesday Partner: Troter A. Electrolytes and Nonelectrolytes 1. Classify the substances and solutions as nonelectrolytes (lowest values), weak electrolytes middle values), or strong electrolytes highest values Important: Make sure conductivity meter is set to appropriate sensitivity range. Strong...
please identify the unknown and write a derivative
Unknown compound 3 Clear liquid Physcial Properties Solubility Dissolve in ethyl ether Not dissolved in water Boiling point 77 IR spectrum Transmitance 3000 1000 2000 Wavenumber cm-1) Classification Positive test in Alkaline Iron (III) Hydroxamate test test CLASSIFICATION TESTS These tests must be done together with known AND FOLLOW PROCEDURE IN YOUR TEXT CARBOXYLIC ACIDS are detected by teating aqueous solutions with limus or pH paper. Also, disolve In NaHCO with bubbles...
than other labs. These are toxicity, volatility, and flammability. We routinely use toxic organic solvents like methanol and acetone that are volatile (have low boiling points), but even solid organic materials can produce vapors that may be toxic. Furthermore, organic materials are flammable, and solvent vapors in the air can and do produce explosive mixtures. You should take some general precautions when doing organic chemistry: Do not get solutions on your skin. You do not need to always wear gloves...
1.)
What side reactions occur during the following steps.
2.) How can the IR spectrum be used to show that there is not
starting material left and the products are ketones?
3.) Describe the major differences and similarities between
the IR spectra of benzoin and benzil. Compare your IR spectrum with
those of benzoin and benzil.
Copper-Catalyzed Oxidation of Benzoin 1. Add a stir bar and 1.5 mL of glacial acetic acid, 0.250 g of NH4NO3 and 0.500 g of...
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...
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