What can cause a low percent yield? In lab we did fischer esterification using benzoic acid...
What can cause a low percent yield? In lab we did fischer esterification using benzoic acid and methanol to yield methyl benzoate. 3.05 grams of benzoic acid were used and 1.10 grams of methyl benzoate were produced. We also washed the product multiple times with water, 10% sodium bicarbonate solution, then saturated sodium chloride solution. Could the washing cause a low percent yield? If so, can you explain why?
Homework Answers
Usually, percent yield is lower than 100% because the actual yield is often less than the theoretical value. Reasons for this can include incomplete or competing reactions and loss of sample during recovery. ... This can happen when other reactions were occurring that also formed the product.
In the case of esterification, when we were doing the washing the impurities from the compound were removed which cause an decrease in weight of product as many time we will do washing some how weight will decrease it cause an decrease in yield but an increase in purity
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What can cause a low percent yield? In lab we did fischer
esterification using benzoic acid...
What are some possible sources of error that would lead to a low yield in the...
What are some possible sources of error that would lead to a low yield in the synthesis of methyl benzoate from benzoic acid and methanol with sulfuric acid using Fischer Esterification.
In this experiment, we did a Fischer Esterification using excess acetic acid, isopentyl alcohol, and sulfuric...
In this experiment, we did a Fischer Esterification using excess acetic acid, isopentyl alcohol, and sulfuric acid to form isopentyl acetate. Then sodium bicarbonate and NaCl were used in the extraction step of the experiment. Is there another method we could have used to calculate percent yield other than using the amount of isopentyl acetate? What are the advantages and disadvantages? (Using GC is not the answer we are looking for.)
This is a Fischer Esterification using the alcohol, methanol, and the carboxylic acid, butyric acid, to...
This is a Fischer Esterification using the alcohol, methanol,
and the carboxylic acid, butyric acid, to create the ester, methyl
butanoate (smells like apple). After refluxing methanol, butyric
acid, and concentrated sulfuric acid, a separatory flask was used
and the ester was extracted using ice water, then diethyl ether,
then 2 portions of sodium carbonate, and a saturated sodium
chloride brine solution. Anyhydrous sodium sulfate was used after
separation to dry the ester. Please help!!
4. Read about infrared spectroscopy...
please help calculate priduct yield and percent yield for FISCHER ESTERIFICATION OF LAURIC ACID lab Product Yield? P...
please help calculate priduct yield and percent yield for
FISCHER ESTERIFICATION OF LAURIC ACID lab
Product Yield? Percent Yield? 0.163 Lauric Acid weight of product = 0.0989
Determine the yield of the products. The first should be the yield of benzoic acid. The...
Determine the yield of the products.
The first should be the yield of benzoic acid.
The ammon plus is should be the yield of benzamide. Please
write out and show all work, theoretical yield etc. Thanks!
Purification-Week add Decant the dry dichloromethane solution into a 25-mlL round-bottom flask, and a few boiling chips. Don't worry if a little magnesium sulfate slips into the distilla- tion flask, it will act as additional boiling chips. Set up an apparatus for microscale simple...
We used the technique of extraction in this lab. After extraction, what was left in solution?...
We used the technique of extraction in this lab. After extraction, what was left in solution? Why is it acceptable for those chemicals to be left to sit for a week? Think about the possible reactions that would or would not occur during the week? In our extraction, we used NaCl solution. Why did we choose to use that vs. water? In this experiment, we did a Fischer Esterification using excess acetic acid, isopentyl alcohol, and sulfuric acid to form...
22. Write an equation that accounts for the solability of benzoic acid in aqueous base, 23....
22. Write an equation that accounts for the solability of benzoic acid in aqueous base, 23. What would you expect to happen if a solution of sodium benzoate were acidified? Write an equation. 24. What would have been the effect of omitting the sulfuric acid from methyl benzoate preparation by reacting benzoic acid with methanol? 25. Criticize the following techniques: (a) Heating a mixture that contains n-hexane using an open flame. (b) For a reaction, heating a mixture that contains...
22. Write an equation that accounts for the solubility of benzoic acid in aqueous base. 23....
22. Write an equation that accounts for the solubility of benzoic acid in aqueous base. 23. What would you expect to happen if a solution of sodium benzoate were acidified? Write an equation. 24. What would have been the effect of omitting the sulfuric acid from methyl benzoate preparation by reacting benzoic acid with methanol? 25. Criticize the following techniques: (a) Heating a mixture that contains n-hexane using an open flame. (b) For a reaction, heating a mixture that contains...
Experiment 12: Synthesis of Benzoic Acid pre-lab (4 pts) 1 (2 pts) Refer to the introduction...
Experiment 12: Synthesis of Benzoic Acid pre-lab (4 pts) 1 (2 pts) Refer to the introduction on the general process of hydrolysis of nitriles to carboxylic acids. Starting with benzonitrile (shown below), show how it is converted to benzoic acid under basic conditions. N 2) (2 pts) The reaction for the synthesis of benzoic acid via benzonitrile hydrolysis is shown below: 1) NaOH, HO YOH + NaCl 2) HCI, H,0 Benzonitrile Density = 1.0 g/mL MM = 103.04 g/mol Benzoic...
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...
This is a Fischer Esterification using the alcohol, methanol,
and the carboxylic acid, butyric acid, to create the ester, methyl
butanoate (smells like apple). After refluxing methanol, butyric
acid, and concentrated sulfuric acid, a separatory flask was used
and the ester was extracted using ice water, then diethyl ether,
then 2 portions of sodium carbonate, and a saturated sodium
chloride brine solution. Anyhydrous sodium sulfate was used after
separation to dry the ester. Please help!!
4. Read about infrared spectroscopy...
please help calculate priduct yield and percent yield for
FISCHER ESTERIFICATION OF LAURIC ACID lab
Product Yield? Percent Yield? 0.163 Lauric Acid weight of product = 0.0989
Determine the yield of the products.
The first should be the yield of benzoic acid.
The ammon plus is should be the yield of benzamide. Please
write out and show all work, theoretical yield etc. Thanks!
Purification-Week add Decant the dry dichloromethane solution into a 25-mlL round-bottom flask, and a few boiling chips. Don't worry if a little magnesium sulfate slips into the distilla- tion flask, it will act as additional boiling chips. Set up an apparatus for microscale simple...
22. Write an equation that accounts for the solability of benzoic acid in aqueous base, 23. What would you expect to happen if a solution of sodium benzoate were acidified? Write an equation. 24. What would have been the effect of omitting the sulfuric acid from methyl benzoate preparation by reacting benzoic acid with methanol? 25. Criticize the following techniques: (a) Heating a mixture that contains n-hexane using an open flame. (b) For a reaction, heating a mixture that contains...
22. Write an equation that accounts for the solubility of benzoic acid in aqueous base. 23. What would you expect to happen if a solution of sodium benzoate were acidified? Write an equation. 24. What would have been the effect of omitting the sulfuric acid from methyl benzoate preparation by reacting benzoic acid with methanol? 25. Criticize the following techniques: (a) Heating a mixture that contains n-hexane using an open flame. (b) For a reaction, heating a mixture that contains...
Experiment 12: Synthesis of Benzoic Acid pre-lab (4 pts) 1 (2 pts) Refer to the introduction on the general process of hydrolysis of nitriles to carboxylic acids. Starting with benzonitrile (shown below), show how it is converted to benzoic acid under basic conditions. N 2) (2 pts) The reaction for the synthesis of benzoic acid via benzonitrile hydrolysis is shown below: 1) NaOH, HO YOH + NaCl 2) HCI, H,0 Benzonitrile Density = 1.0 g/mL MM = 103.04 g/mol Benzoic...
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...
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