Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml) will give two layers in the separatory funnel. Will the aqueous layer be the upper layer or the lower layer?
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- Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml) will give two layers in the separatory funnel.
- Will the aqueous layer be the upper layer or the lower layer?
- If dichloromethane (density ~ 1.3 g/ml) were substituted for the 10% ethyl acetate/hexane solution, which layer would be the aqueous layer?
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- 6.0 mL of cyclohexanol, 8 mL of 85% phosphoric acid, and 10 drops of sulfuric acid are added to a 50-mL round-bottom flask with boiling chips, and the mixture is distilled into an ice-cooled receiver. The distillate is in the form of a colorless bi-phasic mixture. The cyclohexene upper layer is removed from the water layer, and dried over anhydrous calcium chloride. Isolated is cyclohexene as a clear and colorless foul-smelling liquid. Weighing data is given below. Gross mass: 51.24 g Tare mass: 48.04 g Product mass: 3.2g Question: Calculate the theoretical mass of the cyclohexene product, bearing in mind that the cyclohexanol starting material was measured by volume, not by mass (so you must use the density of cyclohexanol to convert milliliters to grams, before calculating the number of moles). Calculate the percent yield of cyclohexene obtained.Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml) will give two layers in the separatory funnel. a. Will the aqueous layer be the upper layer or the lower layer? b. If dichloromethane (density ~ 1.3 g/ml) were substituted for the 10% ethyl acetate/hexane solution, which layer would be the aqueous layer?MAKE A METHODOLOGY : MATERIALS/ REAGENTS WITH SCHEMATIC DIAGRAM . THE PICTURE UPLOADED SERVES AS A GUIDE, DO THE SAME THING BASED FROM THE PIC. Procedure: Place 20 drops of each of 0.2M CuSO4 in a centrifuge tube. Then add 5 drops of freshly prepared 6M (NH4)2S to each centrifuge tube. Record your observation. Centrifuge the mixtures for 3 mins. and decant the supernatant liquid. Add 10 drops of DI water and 10 drops of 6M HNO3. Stir and boil the mixture in a hot water bath for 5 mins. centrifuge the mixture for 3 mins. Decant the supernatant solution from procedure 3. Discard the To each of the supernatant liquid, add 6 drops of 6M H2SO4. Allow themixtures to cool and 5 drops of DI water. To the mixtures in procedure 4, add few drops of concentrated NH3 until the solution becomes basic. Confirm using a litmus paper. Record your observation. Add 1 drop of 5M NaOH and 1 drop of 0.1 M SnCl2 to the centrifuge tube containing Bi3+ ion , centrifuge and decant the supernatant liquid. To…
- Twenty grams of tea leaves was extracted with 250.0 mL water. The aqueous extract was then subjected to liquid-liquid extraction using a total volume of 50 mL chloroform organic solvent.What is the purpose of using NaOH in an extraction experiment? Mark all that apply. Question options: A To acidify the aqueous layer so the organic acid precipitates out of solution B To remove traces of water from the ether layer so neutral compound is dry C To react with the organic neutral compound and remove it from ether layer D To react with organic acid compound to produce water-soluble salt and extract it into aqueous layer I did put C and D but wrong. I did put only D but also wrong. I put B and D also wrong.1. Which of the following may cause an increase in the calculated percent recovery of the recrystallized benzoic acid? a.Adding too much solvent in the receiving flask during hot filtrationb.Using cold water in rinsing the residue from the flask during hot filtration c.Using fluted filter paper during hot filtrationd.Not adding animal charcoal to the solution2. Which set of reagents can confirm that sulfate ions are present in two unkown solutions? a.1.0 M NaOH and excess NH3 b.0.1 M Ba(NO3)2 and 0.01 M KMnO4 c.1.0 M NaOH and 0.1 M K2Zn3[Fe(CN)6]2d.0.1 M Ba(NO3)2 and 1.0 M CH3COOH
- If you had performed the extraction with dichloromethane (d 1.33 g/mL) as the organic solvent and just water as the aqueous layer, describe what is the top and bottom layer and which layer would each of the three starting compounds (benzil, benzoic acid, and alizarin) would be found in.Is the amount of acetic acid extracted using either single extraction or multiple extractions equal to the original amount of acetic acid present in original solution? If not, what happened to the difference in the amount extracted and the original amount of acetic acid?Will the melting point increase or decrease with the benzoic acid, 4-chloroanaline, and naphthalene if : -You do not remove all of the HCl from the first extraction (mixture) -You forget to do the NaOH extraction (aq layer) -You do not rotovap all of the solvent in the final step (organic layer)
- Suppose you have an organic sample X that is somewhat soluble in water, even though it issomewhat more soluble in dichloromethane or ether solvents. But if you do a singleextraction, you get only 60% of your material to transfer from the water to the organic layer.How many “washes” would it take to extract over 90% of your organic material extracted fromthe water layer?Some procedures include the addition of sodium carbonate before liquid-liquid extraction. What is the purpose of this step?1. A student wants to dry a solution of aniline in hexane. Which drying agent should he use for the task? Rationalize the choice. 2. If calcium oxide is used as a drying agent, what is obtained as a product? 3. Why is ill-advised to use P4O10 as drying agents for “wet” acetone?