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what is the purpose of the acid catalyst: sulfuric acid? why
cant acetic acid, which is...
We made esters from carboxylic acids and alcohol. (for one of them, acetic acid + isopentyl...
We made esters from carboxylic acids and alcohol. (for one of them, acetic acid + isopentyl alcohol + couple drops of sulfuric acid). Could someone please explain those. Thank you 1. Consider if we had prepared high molecular weight esters, what problems would this pose regarding our method of analysis 2. We used sulfuric acid as a catalyst, but carboxylic acids are a reagent in this reaction. Would simply using excess carboxylic acid work as efficiently as sulfuric acid to...
4. Using your knowledge of Le Chatelier's principle and the given equation, explain why an excess of acetic a...
4. Using your knowledge of Le Chatelier's principle and the given equation, explain why an excess of acetic acid is used in this experiment. 5. If water was added as the solvent in this reaction would this shift the equilibrium in the desired direction to form more of the product (the ester)? Explain using the given equation and LaChatelier's principle. Alcoho 6. In the two chemical structures below, identify each of the following functional groups as either carboxylic ester, carboxylic...
H3PO4 OH + OH OH salicylic acid acetic anhydride acetic acid acetylsalicylic acid (aspirin) 1. Why...
H3PO4 OH + OH OH salicylic acid acetic anhydride acetic acid acetylsalicylic acid (aspirin) 1. Why is it better to perform acetylation with acetic anhydride rather than using a Fischer esterification with acetic acid? 2. Draw a complete arrow-pushing mechanism for the reaction. 3. When an old sample of aspirin is left in moist conditions, it will begin to smell like vinegar. Draw a reaction scheme and briefly explain what happened.
2. If one were esterifying an expensive alcohol with an expensive carboxylic acid derivative, would it...
2. If one were esterifying an expensive alcohol with an expensive carboxylic acid derivative, would it be wiser to use the acid chloride or acid anhydride reagent? Why? 3. Why is so much NaOH used in the extraction? Recall that only four drops (small amount) of sulfuric acid were used as a catalyst. Esters are an important class of organic molecules, which are formally derived from alcohols and carboxylic acids. Esters occur widely in nature and are often an important...
You add 0.58 mL of n-propanol (0.803 g/mL, 60.1 g/mol) to an excess of acetic acid...
You add 0.58 mL of n-propanol (0.803 g/mL, 60.1 g/mol) to an excess of acetic acid to create the pear ester propyl acetate (102.1 g/mol). If you obtain 0.53 grams of the product, what was your percent yield? You react acetic acid with an unknown alcohol, and obtain the following NMR of the product. What is the unknown alcohol? LLLLLLLL LES LL 20 1-butanol (CH3CH2CH2CH2OH) 2-propanol (CH3)2CHOH) 1-propanol (CH3CH2CH20H) 2-methyl-1-propanol (CH3)2CHCH2OH) 2 butanol (CH3CHOHCH2OHCH) 3 Mi Consider the below general...
A: Esterification ive: To make three common esters and to note their characteristic odour and to...
A: Esterification ive: To make three common esters and to note their characteristic odour and to draw structural diagrams representing each reactions. Set up a 400 mL beaker and apparatus like the example on the front lab bench. Fill the beaker approximately 2/3 full of water to serve as a hot bath. For each of the carboxylic acid- alcohol pair of chemicals below, complete the following Note that the carboxylic acid may be a crystal or a solution. 1. Carefully...
What is the purpose of the acid catalyst in a Fischer esterification? ROH i R OH...
What is the purpose of the acid catalyst in a Fischer esterification? ROH i R OH HC1 R OR It neutralizes the solvent It converts the alcohol into a better electrophile It converts the alcohol into a better nucleophile It converts the carbonyl into a better electrophile It converts the carbonyl into a better nucleophile
acetic acid is 25 ml and alcohol is 20 ml The synthesis of an ester by...
acetic acid is 25 ml and alcohol is 20 ml
The synthesis of an ester by the reaction of a carboxylic with an alcohol is an equilibrium reaction. H - R-OH HO ROH R OR, Recall from general chemistry that, according to Le Caiclista principle, an equilibrium can be shifted toward greater product formation by using an excess of reactant or by removal of a reaction product as it forms. 1. Are any products removed during the reaction period (the...
EXPERIMENT 20 CSI: SMU Part 2. Synthesis of an Ester. Esters are compounds of the form...
EXPERIMENT 20 CSI: SMU Part 2. Synthesis of an Ester. Esters are compounds of the form RCOOR'. They occur naturally in many plants and animals, and can be synthesized. They have a pleasant aroma usually described as "fruity of flowery". In a Fisher esterification an ester is formed from the reaction of a carboxylic acid and an alcohol with a strong acid as a catalyst. The OH contained in the carboxylic acid group 1s replaced with the alkoxy group (O-R")...
QUESTIONS 1. What is the purpose of the sulfuric acid (yes, it's a catalyst, but why...
QUESTIONS 1. What is the purpose of the sulfuric acid (yes, it's a catalyst, but why is it a catalyst? What is it doing that makes the reaction possible? Would the reaction just go slower without it, or would the reaction not go at all? Why?) 2. If isobutyl alcohol (2 methyl propanol) is used instead of tert butyl alcohol, a mixture of products is obtained. One the products is the same as the product obtained with the tert butyl...
4. Using your knowledge of Le Chatelier's principle and the given equation, explain why an excess of acetic acid is used in this experiment. 5. If water was added as the solvent in this reaction would this shift the equilibrium in the desired direction to form more of the product (the ester)? Explain using the given equation and LaChatelier's principle. Alcoho 6. In the two chemical structures below, identify each of the following functional groups as either carboxylic ester, carboxylic...
H3PO4 OH + OH OH salicylic acid acetic anhydride acetic acid acetylsalicylic acid (aspirin) 1. Why is it better to perform acetylation with acetic anhydride rather than using a Fischer esterification with acetic acid? 2. Draw a complete arrow-pushing mechanism for the reaction. 3. When an old sample of aspirin is left in moist conditions, it will begin to smell like vinegar. Draw a reaction scheme and briefly explain what happened.
2. If one were esterifying an expensive alcohol with an expensive carboxylic acid derivative, would it be wiser to use the acid chloride or acid anhydride reagent? Why? 3. Why is so much NaOH used in the extraction? Recall that only four drops (small amount) of sulfuric acid were used as a catalyst. Esters are an important class of organic molecules, which are formally derived from alcohols and carboxylic acids. Esters occur widely in nature and are often an important...
You add 0.58 mL of n-propanol (0.803 g/mL, 60.1 g/mol) to an excess of acetic acid to create the pear ester propyl acetate (102.1 g/mol). If you obtain 0.53 grams of the product, what was your percent yield? You react acetic acid with an unknown alcohol, and obtain the following NMR of the product. What is the unknown alcohol? LLLLLLLL LES LL 20 1-butanol (CH3CH2CH2CH2OH) 2-propanol (CH3)2CHOH) 1-propanol (CH3CH2CH20H) 2-methyl-1-propanol (CH3)2CHCH2OH) 2 butanol (CH3CHOHCH2OHCH) 3 Mi Consider the below general...
A: Esterification ive: To make three common esters and to note their characteristic odour and to draw structural diagrams representing each reactions. Set up a 400 mL beaker and apparatus like the example on the front lab bench. Fill the beaker approximately 2/3 full of water to serve as a hot bath. For each of the carboxylic acid- alcohol pair of chemicals below, complete the following Note that the carboxylic acid may be a crystal or a solution. 1. Carefully...
What is the purpose of the acid catalyst in a Fischer esterification? ROH i R OH HC1 R OR It neutralizes the solvent It converts the alcohol into a better electrophile It converts the alcohol into a better nucleophile It converts the carbonyl into a better electrophile It converts the carbonyl into a better nucleophile
acetic acid is 25 ml and alcohol is 20 ml
The synthesis of an ester by the reaction of a carboxylic with an alcohol is an equilibrium reaction. H - R-OH HO ROH R OR, Recall from general chemistry that, according to Le Caiclista principle, an equilibrium can be shifted toward greater product formation by using an excess of reactant or by removal of a reaction product as it forms. 1. Are any products removed during the reaction period (the...
EXPERIMENT 20 CSI: SMU Part 2. Synthesis of an Ester. Esters are compounds of the form RCOOR'. They occur naturally in many plants and animals, and can be synthesized. They have a pleasant aroma usually described as "fruity of flowery". In a Fisher esterification an ester is formed from the reaction of a carboxylic acid and an alcohol with a strong acid as a catalyst. The OH contained in the carboxylic acid group 1s replaced with the alkoxy group (O-R")...
QUESTIONS 1. What is the purpose of the sulfuric acid (yes, it's a catalyst, but why is it a catalyst? What is it doing that makes the reaction possible? Would the reaction just go slower without it, or would the reaction not go at all? Why?) 2. If isobutyl alcohol (2 methyl propanol) is used instead of tert butyl alcohol, a mixture of products is obtained. One the products is the same as the product obtained with the tert butyl...
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