1. Why is water added in two separate portions to the acetic anhydride/concentrated H2SO4 mixture? 2. What two techniques are used to facilitate the aspirin crystallization? 3. Why is it necessary to air dry the aspirin?
Q: In the synthesis of dibenzalacetone, what is the purpose of swirling the flask for 20 mins? It makes…
A: Dibenzalacetone is prepared By cross Aldol condensation Reaction .
Q: 4. Why do we have to wash the ether layer using 1 N HCl during the workup?
A: Answer is given below
Q: What is the purpose of using NaHCO3 solution in the isolation step of the Fischer esterification…
A: In the given question the detailed reaction with reactants was not provide, will discuss about…
Q: What is the reason behind the portion-by-portion evaporation of DCM in the extraction of eugenol?
A: Answer - According to the question - DCM (dichloromethane ) help seperating the eugenol and water…
Q: What is the purpose of the following? b) Adding H2SO4 to the methyl benzoate in the nitration…
A: Introduction: Nitration reaction is a chemical process to introduce nitro group into an organic…
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A: In liquid-liquid extraction, separation of compounds takes place on the basis of their relative…
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A: Here we are required to provide the reason why starch indicator is not used at the beginning rather…
Q: The pKas of chemicals HX and HY are 5 and 7 respectively. The pKa of carbonic acid H2CO3is 6. If you…
A: The pKa of HX is 5 and the pKa of HY is 7, and the pKa of NaHCO3 added in the separatory funnel is…
Q: How can the Eugenol content be separated from the alkaline solution?
A: Eugenol also known as clove oil. This oil is extracted from cloves and is used to treat toothache,…
Q: 1. A compound of molecular formula C5H₁00 forms a yellow precipitate with reagent and a yellow…
A: #1.(a): Given the molecular formula for the unknown compound is C5H10O Degree of unsaturation(DU) of…
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Q: why is it necessary to cool the acidic exact of aniline in ice before adding solid sodium hydroxide?
A: The addition of NaOH to an acidic extract of aniline is a step of acid-base extraction which is a…
Q: Imagine if one replaced acetic anhydride with benzoic anhydride (shown). Draw the structure of the…
A: The detail explanation of the question are given below
Q: What product would you obtain if you evaporated the water from the NaOH layer prior to acidifying…
A: Ether layer contains acetanilide (C6H5NHCOCH3) and p-tert-butylphenol (p-C4H9-C6H4OH). On the…
Q: You have a sample of benzophenone which is contaminated with a small amount of benzoin. Which of the…
A: #1: Separation of benzophenone which is contaminated with a small amount of benzoin: Both…
Q: 1. Why were the reagents equilibrated in water bath before mixing? 2. What is the purpose of starch…
A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…
Q: a. Sodium hydroxide and ethanol are added to 2-naphthol and then refluxed for thirty minutes before…
A:
Q: Why are solutions of KMnO4 and Na2S2O3 generally stored in dark reagent bottles?
A: The reason why solutions of KMnO4 and Na2S2O3 generally stored in dark reagent bottles have to be…
Q: What is main objectives in extraction of lycopene from watermelon.
A: Lycopene Lycopene, a red pigment, is widely present in foods that are red in colour, including…
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A: We have to determine the compounds A and B.
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A: Given the data for the unknown compound is: C4H6O is a colorless liquid and the boiling point is…
Q: Why is aniline soluble in aqueous HCl?
A: The solubility of a compound depends on their polar or non-polar nature. It follows a simple rule…
Q: Why does β-naphthol dissolve in a basic medium?
A: Ionic compounds are easily solvated by water molecules due to ion-dipole interaction and thus they…
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A:
Q: What is the strength of the NaOH solution in saponification process?
A: Strength of NaoH in esterification reaction is
Q: 5-bromoacetylsalicylic acid melts at 60 °C and is inert and almost insoluble in water at room…
A: Since you have asked multiple questions, we will solve first one for you. For any particular…
Q: Briefly explain why OtBu- sometimes favored over hydroxide as an elimination reagent?
A:
Q: if 54.9% of ethenol is in the distillate what would be the sloute and the solvent in the mixture?…
A: Given that, % of ethanol = 54.9% then,
Q: 5. The pKas of chemicals HX and HY are 5.0 and 7.0 respectively. The pKa of carbonic acid H,CO, is…
A: Extraction is the transfer of component from one layer to another
Q: 5-bromoacetylsalicylic acid melts at 60 °C and is inert and almost insolube in water at room…
A:
Q: Why does the eugenol move from the water layer to the dichloromethane layer during extraction?
A: In separation process, aqueous and organic layer gets separated.
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Q: Why is CH2Cl2 added to the collected distillate? PLZ help! {isolation of eugenol from cloves}
A:
Q: rocedure: 1. Place separately in clean test tubes five drops of acetone and acetaldehyde 2. To both…
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Q: 1) Calculate the volume of the concentrated sulfuric acid required. 2) What precautions are required…
A: Above equation is necessary for calculate the volume of concentrat H2SO4
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A: Extraction of compounds from the mixtures.
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A: Given information: Separating t-butyl chloride from the reaction mixture.
Q: Why did the demonstrator add sodium sulfate (Na2SO4) to the dichloromethane layer after he had…
A: it is explained as:
Q: Why do you need a strong base like sodium hydroxide to extract 2napthol out of ether? because a…
A: 2-naphthol is insoluble in water. However, due to the O-H bond, it is a weak acid. Thus, on reaction…
Q: a. Draw a flow diagram for the separation of CH3CH2CH2Br (CH3CH2CH2)3N, and CH3CH2CO2H. b. Diagram…
A: Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: Why is eugenol steam-distilled rather than purified by simple distillation?
A: Eugenol, also called clove oil, is an aromatic oil extracted from cloves that is used widely as a…
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A: Ferrox test solution is hexane, alcohol, ether, which are generally used for prepared ferrox paper…
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Q: 2. Is the hydrolysis of benzonitrile to benzoic acid carried out in today's experiment acidic or…
A: As per statement of experiment ( basic hydrolysis of benzonitrile) means getting benzoic acid from…
Q: Why condensed tannins are not hydrolysed by HCl?
A: Tannins are phenolic compounds of high molecular weight capable of precipitation of animal proteins…
Q: How many millimoles of Na3PO4 are contained in 800 mg of this reagent?
A: Given The mass of Na3PO4 is 800 mg.
Q: Why is the methyl benzoate extracted with a Na2CO3 solution and why is MgSO4 added before the final…
A: To separate the methyl benzoate from the benzoic acid, Na2CO3 is dissolved in the mixture, benzoic…
Q: what
A:
Q: a) From this flow chart, which acid is extracted when sodium bicarbonate is used as an extraction…
A: a. Benzoic acid strong acid and reacts with sodium bicarbonate (weak base). Phenol cannot react with…
Laboratory: esters and preparation of aspirin
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- What is the reason behind the portion-by-portion evaporation of DCM in the extraction of eugenol?1. What is the reason behind the portion-by-portion evaporation of DCM in the extraction of eugenol? 2. Enumerate some pharmaceutical and medical uses of eugenol 3. What does the ferric chloride test identify? Is it specific test for eugenol? Why or why not?Why is the treatment with 1M HCl omitted from a work-up procedure when 4-nitrocinnamic acid is the starting material?
- a. Give at least three characteristics of dichloromethane that makes it a good extracting solvent for the alkaloid.b. Why is it necessary to remove a stopper from a separatory funnel when the liquid is being drained from it through a stopcock?c. What are emulsions? Why do they form during extractions? How is the formation of an emulsion minimized? How are emulsions removed?What is the purpose of adding sodium sulfate to the organic layer after extraction? A. To remove water from the organic phase B. To act as a base to deprotonate the tannins, making them water soluble C. To act as a base to deprotonate the caffeine, making it water soluble D. To remove organic solvents from the aqueous phasein a liquid-liquid extraction, why is ethyl acetate a good initial solvent to dissolve a mixture of benzoic acid, 4-bromoacetophenone and ethyl 4-aminobenzoate? the extraction solvent is sodium bicarbonate.
- 1. Why are solutions of KMnO4 and Na2S2O3 generally stored in dark reagent bottles?5-bromoacetylsalicylic acid melts at 60 °C and is inert and almost insolube in water at room temperature. Why can’t water be used as recrystallizing solvent for this compound?a. Draw a flow diagram for the separation of CH3CH2CH2Br (CH3CH2CH2)3N, and CH3CH2CO2H. b. Diagram a two-stage dichloromethane (d=3) extraction of an aqueous solution, showing how this procedure differs from the diethyl ether extraction diagrammed in (a).
- What is the purpose of the wash with water using separatory finnel? Bicarbonate?Why do we add sodium hydroxide to the extracted organic solvent in caffeine extraction procedure? A. to get rid of basic impurities B. to get rid of acidic impurities. C. to get rid of polar impurites. D. to get rid of phenolic impurities.Why is eugenol steam-distilled rather than purified by simple distillation?