What is the purpose of a brine wash (saturated sodium chloride solution) in a liquid/liquid extraction? O Sodium chloride is an organic soluble material which provides a "seed" which encourages crystal growth O Sodium chloride is alkaline and therefore serves as a good way to neutralize acidic species such as HCI or H,SO4 O Sodium chloride aids in dissolving materials that are typically insoluble in both organic and aqueous media O Washing with brine is convenient way to remove residual water from the organic layer prior to treating the organic layer with a solid drying agent

What is the purpose of a brine wash (saturated sodium chloride solution) in a liquid/liquid extraction? O Sodium chloride is an organic soluble material which provides a "seed" which encourages crystal growth O Sodium chloride is alkaline and therefore serves as a good way to neutralize acidic species such as HCI or H,SO4 O Sodium chloride aids in dissolving materials that are typically insoluble in both organic and aqueous media O Washing with brine is convenient way to remove residual water from the organic layer prior to treating the organic layer with a solid drying agent

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter33: Automated Methods Of Analysis

Section: Chapter Questions

Problem 33.8QAP

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Fill in the blanks: a) The component of the mixture that becomes a water soluble salt by treating the two component mixture with sodium hydroxide solution has the highest _______________. b) The lower phase in equipment used for liquid-liquid extraction in a water-dichloromethane mixture is_____________, because _______________. c) The component of the mixture that becomes a water-soluble salt is the one with the greatest ______________
Solution Calculations Using unit analysis, clearly show the set-ups for your calculations. You wish to prepare 50.0 mL of 2.30 x 10–2 M solution of Levothyroxine (hint-how many grams will you need of Levothyroxine?) 1. Describe how to prepare this solution from the pure drug and deionized water. Analytical balances and volumetric flasks are available to you. (Assume that Levothyroxine dissolves in water, at least to the extent necessary for this problem.) Use complete sentences in your description of the solution preparation process. a. A patient is given 2.0mL of a 3.00% (m/v) solution of Levothyroxine, how many milligrams of the drug did they receive? b. What is the molarity of a 3.00% (m/v) solution of Levothyroxine?
Using any chemical concept (like concepts in liquid liquid extraction, concepts in recrystlliazation, etc) in an expirment of extraction of Caffein, make a connection to ONE of the following: 1) an event in the news, 2) your career plans, 3) a hobby of yours, 4) another course you are taking, or 5) your personal life.Your writing should find at least one way, if not more, in which the chemical concept you have chosen to talk about is demonstrated in the connection.
The separation and purification processes given below and the method used against them are given. Which or which of these pairings are correct? I. Brewing of tea - ExtractionII. Purification of water impurities - ChromatographyIII. Separating olive pomace from olive oil while producing olive oil-DecantationIV.Petroleum fractions obtaining - Ordinary distillationV. Obtaining essential oils and using them in perfume making - Water-steam distillationA. I, II, III, IVB. I, II, III, IV, VC. I, IV, VD. I, II, III, VE. I, II, V
Carboxylic acids, including fatty acids and benzoic acids, are often present inboth municipal and industrial effluents. Describe a sample preparationcombined with GC method for identification and determination of carboxylicacids in raw wastewater at ppb (µg L-1) level. Point out a suitable samplepreparation technique and GC conditions in details and give justifications foryour choice
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.
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please Answer all four parts Chemistry 1. The name of the equipment used to separate 2 immiscible phases by extraction is _____________________. 2. The component of the mixture that transforms into a water-soluble salt on treating the two-component mixture with sodium hydroxide solution is the one that has the highest ___________________. 3. The lower phase in equipment used for liquid-liquid extraction in a mixture of water-dichloromethane is_________________, because __________________ ______________________________________________. 4. What is magnesium sulfate used for at the end of the extraction? How I know can you delete?
Calculate the percent error in Avogadro's number calculated by using the following experimental data. Pipette calibrated as 30 drops/mlDiameter of the watch glas:15.5 cmNumber of drops to complete monolayer:23Concentration of stearic acid solution: 1.2x 10^-4g/ml.
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Diprivan® (propofol) is a commonly used sedative-hypnotic agent used for sedation and anesthesia during minor as well as major surgical procedures. It is a liquid preparation administered through the IV route of drug administration. Based on what you see below, this prep is most likely a(an): Emulsion Microemulsion Suspension Solution