Create a separation scheme to separate 50% ethyl 4-aminobenzoate, 40% 1,2,4,5- tetrachlorobenzene, and 10% 1,4-dibromobenzene from a 1g mixture. The solutions available are water, 1.0 M NaOH, 6.0 M NaOH, 1.0 M HCI, 6.0 M HCI, 1M NaHCO3, saturated aqueous sodium chloride, dichloromethane, ethyl acetate, 95% ethanol, methanol, isopropyl alcohol, acetone, hexane, and toluene. Column chromatography and distillation are unavailable. I understand that the first step would be an acid base extraction to separate the ethyl 4- aminobenzoate from the rest of the compounds, but how would I separate the 1,2,4,5- tetrachlorobenzene from the 1,4-dibromobenzene?

A student dissolved 4 drops of an unknown compound in 1 mL of methylene chloride (dichloromethane) in a test tube. They added 5 drops of a 2% solution of bromine in dichloromethane dropwise and mixed the contents within the test tube gently. They observed the red-brown color discharges (turns colorless) until the last drop. What compound is most likely the unknown? ©GMU 2020 Oa. Methanol b. Cyclohexane c. n-Butyl Bromide O d. Hex-2-ene COLE QUESTION 6 A student placed 2 drops of an unknown sample in a test tube and added 2 mL of ethanol to the test tube while mixing gently. They added 2 drops of potassium permanganate reagent to the test tube and mixed the contents of the test tube gently. The initial color was a deep purple but then changed to a yellow color which precipitates as a brown solid. What compound is most likely the unknown? OGMU 2020 a. Cyclopentane O b. Cyclohexene c. 1-Pentyl Chloride d. 2-Propanol SOUL QUESTION 7 A student performed the Beilstein test within a chemical…

A student prepared 2-butanone (C4H&O) in the lab. To determine the purity of the product, the ketone was reacted with excess hydroxylamine hydrochloride liberating HCI. In this study, as much as 3.00 ml of sample was diluted to 50 mL and was treated with an excess of hydroxylamine hydrochloride. The liberated HCI was then titrated with 0.9989 M NaOH, requiring 32.68 mL to reach the end point. 1. Show how 2-butanone can be prepared! 2. Determine the percent purity of the sample, given that the density of 2-butanone is 0.805 g/mL!

benzoic acid and 2- naphthol

You have a solution of the three molecules below in a suitable organic solvent. NH₂ ملو OH In addition to the organic solvent and the three molecules, you have access to the following solutions: 1 M NaOH 1 M HCI 1 M CH3COOH 1 M Na2HPO4 Outline a method for how you would separate this solution into its component parts and briefly explain your rationale. You do not need to provide the level of detail shown in the Experimental; just the basics will be sufficient (e.g. wash with _____ to separate component __, then wash with _____ to separate component Y, etc.). Hint: you might need to search their pką values! You can write in paragraph style or organize your steps in a numbered list. 111)

2.1g of sample are dissolved in methylene chloride and the sample is extracted with an aqueous solution of acid and base. Three compounds are isolated - 0.7g of ethyl p-aminobenzoate, 0.6 g of acetanilide, and 0.5 g of benzoic acid. Calculate the % composition of ethyl p-aminobenzoate in the recovered mixture. (Round the answer to 1 significant figure. Give just the number, not a % sign.)

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.

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.

A sample with a mass equal to 0.7500 g may contain NaHCO3, Na2CO3 and/or NaOH. The sample was dissolved and titrated with a 0.1090 mol L-1 HCl solution, spending 23.00 mL to reach the phenolphthalein end point and another 15.00 mL to reach the methyl orange end point. a) Deduce the composition of the sample b) Calculate the % (w/w) of the components. Data: Na = 22.99           O = 16.00    H = 1.008        C = 12.01

You prepare a buffer solution from 10.0 mL of 0.100M MOPS (3‑morpholinopropane‑1‑sulfonic acid) and 10.0 mL of 0.075 M NaOH. Next, you add 1.00 mL of 4.15×10−4 M lidocaine to this mixture. Denoting lidocaine as L, calculate the fraction of lidocaine present in the form LH+. MOPS Ka = 6.3 * 10^-8 Lidocaine Kb = 8.7 * 10^-7       ( Please type answer note write by hend )