After extraction and prior to evaporation of the organic layer, what experimental step should be performed? O The organic layer needs to be dried with sodium sulfate and filtered. OThe organic layer needs to be tested against litmus to ensure it is basic. The organic layer needs to be tested against litmus to ensure it is acidic. O Performing an extraction was a mistake. A distillation should have been used to purify the desired material.

After extraction and prior to evaporation of the organic layer, what experimental step should be performed? O The organic layer needs to be dried with sodium sulfate and filtered. OThe organic layer needs to be tested against litmus to ensure it is basic. The organic layer needs to be tested against litmus to ensure it is acidic. O Performing an extraction was a mistake. A distillation should have been used to purify the desired material.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

Please send me the question in 20 minutes it's very urgent plz
you weigh your crude sample (1.538 g) and recrystallize with hot isopropanol. How do you know how much isopropanol to add?
5. Which term is INCORRECTLY defined? a. linear range - the range over which the response of an analytical method is proportional to analyte concentration b. dynamic range concentration range over which there is a measurable response to analyte, though the response is not linear c. blank solution - a solution containing all reagents and solvents used in the analysis to which no analyte is deliberately added d. standard solutions - solutions for which the standard deviation is known - 6. True or False: Internal standards correct random error caused by run-to-run variation. a. True b. False
Question 4 What is the approximate boiling point of the liquid in the mixture with a lower boiling point? Sample Distillation Data 120 100 80 60 40 20 0 0 0.5 00 1 ● 1.5 2 2.5 3 3.5 ● ● 4 4.5
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 these is NOT true of a good recrystallization solvent? Which of these is NOT true of a good recrystallization solvent? a) The compound is insoluble in the solvent when it is cold. b) The solvent boiling temperature is at least 40 °C. c) The solvent has many impurities. d) The compound is soluble in the solvent when it is hot.
You are attempting to purify a compound via recrystallization. You prepare the process through the following method: 1) Dissolve the material in a minimal amount of hot EtOH. 2) Slowly add hot water until the compound is slightly cloudy. 3) Add a small amount of EtOH until the solution is just clear (still hot). 4) Cool to RT. Upon cooling to RT you notice that the compound is not precipitating out of solution. You decide to boil off some ethanol. Upon completing this step and cooling to RT you notice that the compound is precipitating out as desired! In which solvent is your compound the least soluble? Ethanol O Water O The ethanol water mixture Insoluble in all of these solvents
Start with 15mL of 0.100M HCl. Pipette 10mL of the 0.100M HCl into a 250mL beaker. Then dilute it to around 100mL with distilled water. What would the concentration of HCl be?
In Purification by Recrystallization, why the solution must be filtered while hot?
Based on the melting point of your impure solid, you look at the given samples and believe you havecompound A. Compound A is recrystallized using a mixed solvent system of ethanol and water. You add1 ml of hot ethanol to your sample and it doesn’t completely dissolve. You continue to add hot ethanolbut there isn’t any change. Some solid remains. What should you do next?
In a thin layer chromatography (TLC) experiment, solute A traveled 20 mm while solute B traveled 30 mm. The solvent traveled 40 mm. Which has the greater affinity for the solvent? a. not enough data b. solute B c. solute A d. both A & B have equal affinity
ORANGE II SYNTHESIS Describe the recrystallization process of the Orange II dye in 95% ethanol. (List the procedures)