EXTRACTION SEPARATION OF BENZOIC ACID FROM A MIXTURE OF BENZOIC ACID AND NAPHTHALENE 12 of 78EXPERIMENTAL PROCEDURE:1. Weigh to two decimal places, about 2 g of the mixture of benzoic acid and naphthaleneand transfer it to a 100 mL conical flask. Record the mass, accurately, in the resultsreport.2. Add about 40 mL of ethyl acetate (an organic solvent) into the conical flask and shakeit gently until all the solid has dissolved.3. Make sure that the tap of a separating funnel is closed. Pour the solution into theseparating funnel.Separating FunnelFigure 14. Add approximately 20 mL of 2M NaOH, place the stopper onto the separating funneland hold the separating funnel with both hands. Turn the funnel upside down and shakeit pointing the stem away from other students. Vent the funnel to release the pressureafter shaking by holding on to the stopper securely and slowly opening the tap. Repeatthe shaking and venting process few more times until the sound of the vapors releasedis no longer audible.5. Clamp the separating funnel on a stand, remove the stopper and let the layers separate.After the layers have separated, run off the lower (aqueous) layer into a 250 mL beaker.6. Repeat steps 4-5 with another 20 mL portion of 2M NaOH, and add the lower layer tothe extract in the beaker. The benzoic acid (in form of a salt, benzoate) has now been12 CHEM3322EXPERIMENT 3: ExtractionName:ID:Q1. Give three criteria for a good extraction solvent.Q2. Write a balanced chemical equation for the acid-base reactions involved in thisexperiment.Q3. Which is the bottom phase in a water/methylene chloride (d=1.325) system? Brieflyexplain your predictions

The reactants and substrates must be easily soluble in the solvent The solvent should not react with…

CHEM3322 EXPERIMENT 3: Extraction Name: ID: Q1. Give three criteria for a good extraction solvent. Q2. Write a balanced chemical equation for the acid-base reactions involved in this experiment. Q3. Which is the bottom phase in a water/methylene chloride (d=1.325) system? Briefly explain your predictions

CHEM3322 EXPERIMENT 3: Extraction Name: ID: Q1. Give three criteria for a good extraction solvent. Q2. Write a balanced chemical equation for the acid-base reactions involved in this experiment. Q3. Which is the bottom phase in a water/methylene chloride (d=1.325) system? Briefly explain your predictions

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter11: Isolation Of Caffeine From Tea Le

Section: Chapter Questions

Problem 1Q

See similar textbooks

Similar questions

Please type all of the parts to this question occordingly to the instructions. Here is an example of a formal procedure based off of the experiment presented in Mohrig:Sodium hydroxide (4.6 g) was dissolved in water (25 mL). This solution was added to a 100 mL round bottom flask along with methyl salicylate (2.0 mL) and a stir bar. The mixture was heated at reflux for 15 min and then progressively cooled to 5 °C. The solution was acidified with 3M sulfuric acid (15-20 mL), and the resulting solid was collected by vacuum filtration. The crude salicylic acid was recrystallized from water to yield ???? g of final solid. The melting point and IR were taken to assess purity. Calculate the molarity of the solution of sodium hydroxide that is used.a. M = b. If the original procedure is the base scale (100%), how far are we scaling down the reaction when using 0.75 mL of methyl salicylate? (Example: the original uses 2.0 mL, if we were to use 1.0 mL, we would be scaling the reaction down…
Which of the following is expected to achieve the best recovery of an organic compound from an aqueous solution? 1.Three extractions with 20 mL of ethyl acetate per extraction (60 mL total) 2.Two extractions with 30 mL of ethyl acetate per extraction (60 mL total). 3.One extraction with 60 mL of ethyl acetate. 4.In theory these extractions yield identical recoveries of the organic compound.
Your employer hands you a heterogeneous mixture and asks you to isolate all of thehexane that you can from it. After some analysis, you determine that the mixture contains toluene, hexane,benzoic acid, water, sodium chloride, and sand. Explain how you would isolate pure hexane from thismixture. Remember that you can use techniques such as filtration, extractions, and acid/base chemistrythat we learned earlier in this course in addition to distillation. You may need to look up solubilities and/orboiling points online to solve this problem. You only need to isolate the hexane?
Which solvent would be the best choice for use as an extraction solvent in a separatory funnel with an aqueous solution of NaHCO3 followed by rotoevaporation? Hint: Consider the ability of the solvent to dissolve a wide range of substances, its miscibility with water, and its ability to evaporate the solvent easily by rotoevaporation. ethylene glycol
During your first day on the job as a research assistant, you are preparing 50 mL of hybridization solution with the following components and working concentrations: 50% formamide 5X sodium salt citrate 0.5% sodium dodecyl sulfate You start from the following concentrated stock solutions: 100% formamide 20X sodium salt citrate 20% sodium dodecyl sulfate How much of each concentrated stock solution and water will you add?
Considering the procedure below: “Determination of the concentration of HCl: Pipette 10 mL of hydrochloric acid and transfer to a 100 mL volumetric flask, complete the volume with water and homogenize. Remove a 10 mL aliquot of this solution and transfer it to a second dilution in a 100 mL volumetric flask, complete the volume with water and homogenize. Take a 20 mL aliquot of this last solution and transfer to a 250 mL erlenmeyr and add 20 mL of distilled water and 4 drops of the acid-base indicator. Titrate with a previously standardized 0.100 mol/L sodium hydroxide solution until the indicator turns.” Answer: a) In this titration, the indicator used is phenolphthalein. Discuss the use of this indicator considering its turning range and pH at the stoichiometric point of the titration. Justify. b) Considering that the volume of titrant used was equal to 24.5 mL, calculate the concentration of HCl in the sample in mol/L.
Which of the following would be an optimal choice for a solvent extraction diluent and why? For the others, what limitations hold them back? a) Dodecane b) Methane c) Decanol d) Chloroform
ALL INFORMATION NEEDED IS PROVIDED, I NEED FIRST QUESTIONS ANSWERED FIRST BEFORE OTHERS CAN BE ANSWEREDRate = -(Delta[RCl])/Delta t andln[RCl]t=-k*t+ln[RCl]0 < [R-Cl]-time equation Test tube A = 0.30 of 0.10M NaOH(aq), 6.70ml DI H2O & 1 drop of bromophenol bue Test Tube B = 3.00M of 0.10M R-CL in acetone. Mix together in 3 water baths Bath A Trial 1= 20C, 53.6s Trial 2= 20C, 49s for color to changeBath B Trial 1= 32C, 18s Trail 2= 32C, 20s Bath C Trial 1= 10C, 204s Trial B= 10C, 200s average out both trials for each bathcolor change happens after 10% of R-Cl has reacted so In terms of R-Cl this means that 10% of the R-Cl has reacted and ____ of the R-Cl is left Q1. at the time of the color change [R-Cl]t=____[R-Cl]o (Fill in the blank) Q4. Substitute the value of [R-Cl]t into appropriate equation listed above and solve for k in terms of [R-Cl] and t. Q5. Use average time for each temp and determine the value of k (with units) at each temperature Q6. Rearrange the Arrhenius…
Which solvent would be the best choice for use as an extraction solvent in a separatory funnel with an aqueous solution of NaHCO3 followed by rotoevaporation? Hint: Consider the ability of the solvent to dissolve a wide range of substances, its miscibility with water, and its ability to evaporate the solvent easily by rotoevaporation. ethanol hexane toluene ethylene glycol methylene chloride
You are employed as a coop student at the Drug and Alcohol Testing Association of Canada (DATAC) developing analytical tests for sports doping agents. You are asked to prepare a procedure for the extraction of methylphenidate, the active compound in Ritalin, from urine samples (consider them as simple aqueous layers, you do not need to consider other components!). The goal of the procedure is to extract the methylphenidate into an organic layer which will then be evaporated, and the residue will be tested for the drug.You find that methylphenidate is highly soluble in 2-methyltetrahydrofuran, a bio-renewable solvent. Draw the structure of 2-methyltetrahydrofuran and give two reasons why it is a good solvent choice for liquid-liquid extraction.
You are employed as a coop student at the Drug and Alcohol Testing Association of Canada (DATAC) developing analytical tests for sports doping agents. You are asked to prepare a procedure for the extraction of methylphenidate, the active compound in Ritalin, from urine samples (consider them as simple aqueous layers, you do not need to consider other components!). The goal of the procedure is to extract the methylphenidate into an organic layer which will then be evaporated, and the residue will be tested for the drug.Your colleague is helping you develop the urine test. They suggest that the urine should be adjusted to a pH above 7 before extracting with the organic solvent. Why is this necessary? Support your explanation with a full arrow-pushing mechanism for the reaction that would occur if the pH was below 7. Include all formal charges, intermediates (if applicable) and products.
Write the equations for the acid-base reactions involved in this experiment. Clearly show the reactants and products for each chemical equation. Experiment: seperation of caffeine and benzoic acid by acid-base extraction Things used in lab: -solid mixture of caffeine and benzoic acid -40mL of dichloromethane -20mL of 1.0 M NaOH -magnesium sulfate as drying agent for caffeine isolation -3.00 M HCl for recovery of benzoic acid