After the extraction process, the organic solvent containing the organic compound was cooled and filtered after the crystals appeared. Upon filtration, the filter paper with the crystals are weighed immediately. Assume there were no additional steps in between and after, what are the possible errors committed in this set up?

After the extraction process, the organic solvent containing the organic compound was cooled and filtered after the crystals appeared. Upon filtration, the filter paper with the crystals are weighed immediately. Assume there were no additional steps in between and after, what are the possible errors committed in this set up?

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter14: Chromatography

Section: Chapter Questions

Problem 9P

See similar textbooks

Similar questions

A three-component mixture containing compounds A, B, and C is separated by simple distillation. A fraction from that distillation is collected and analyzed by gas chromatography. The resulting chromatogram is overlaid on a ruler in the figure shown below. Using this figure and the data contained therein, determine the percentage composition of each component in this fraction by the triangulation method (i.e. determine the percentages of A, B, and C in this fraction). Be sure to show the setup for your calculations. 15 10 AAA 5. B 10 15 20 25 30 35 (both axes are in mm)
In an extraction procedure, it is advisable to: O put the aqueous layer down the drain put the organic layer in the aqueous waste throw away all layers as soon as you have extracted them save all layers until an experiment is complete
i need help determining amount recovered in an extraction. i started with a .51g mix of naphlathene/benzoic acid. then, i ended up with the organic in the flask weighing 56g, with the initial weight of the flask without product being 46g. how do i determine amount recovered AND the % recovery?
4. A fat sample with combination of acids contain standard hydrochloric acid for blank and sample with 8mL and 5mL respectively. The normality of the standard hydrochloric acid is 0.93N and the weight of the sample is 3 grams. Calculate the saponification value.
In the second paragraph you should define and describe the process of gas chromatography. In this paragraph answer the following questions: a) Why might it be necessary to dilute the sample? Approximately how much sample is used? b) Describe good injection technique. What sort of syringe is used in gas chromatography? c) What property of compounds will make the retention time longer or shorter? Use as an example ethyl acetate, propyl acetate, and butyl acetate, since these compounds are the ones we are studying in this experiment. d) What are a few different types of detectors and how do they work?
Answer the questions below. a) 500 ml. Acetic acid in 200 mL acetic acid-water mixture containing 30% acetic acid by volume with pure isopropyl ether will be separated by LIQUID-LIQUID extraction. Assuming the dispersion coefficient of acetic acid in isopropyl ether+water carjumine is 2, calculate the amount of acetic acid that passes into the organic phase and the extraction yield. b) What are the desired properties of the solvents used in liquid-liquid extraction processes?
What could have gone wrong in the separation and purification process to result in the disparity from the observed and expected yields? Select all that apply A) Both the benzoic acid and sand may have been wet before the student recorded the masses, hence the increase in expected masses. B) The student may have filtered the benzoic acid while cold. Hence the sand could have been contaminated with benzoic acid and resulted in a higher mass for sand. C) The sand may have dissolved in the hot water along with the benzoic acid, hence, the recorded mass for benzoic acid was more. D)The benzoic acid may have been cooled down too quickly on ice thereby allowing other soluble impurities to crystallize with benzoic acid causing the increase in the expected mass
Which statement about liquid-liquid extraction is not correct? * A- A solvent must be available that is miscible with the solution containing the substance to be extracted. B- The solvent used for extraction must have a good ability to dissolve the desired substance. C- The denser solution forms the bottom layer in the extraction funnel. D- The extraction funnel must be vented during the extraction procedure to prevent excessive build-up of pressure inside the extraction funnel. E- All these statements are correct.
Stoichiometry: Prolonged exposure of some functionalities to the eluent (methanol) in this experiment may lead to undesirable reactions. In one case, Acetylsalicylic acid (Aspirin) can react with methanol to form salicylic acid and methyl acetate. If 800 mg of Acetylsalicylic acid and 1 mL of Methanol undergoes such a side reaction (known as "Methanolysis") to completion: (a) write a balanced equation (draw all molecules instead of writing chemical formulas), (b) what is the limiting reagent? (c) predict the grams of salicylic acid and methyl acetate to be produced in this process. Show calculations. Hint: you can determine the grams of 1 mL of Methanol through its density.
Which error will lead to negative deviation from the theoretical Keq? a. cuvette was filled to the brim with the sample. b. cuvette was washed with sodium hydroxide instead of distilled water. C. standard with the highest concentration was used in autozero. d. cuvette was misplaced such that the opaque side faces the light
In part A.3. as the sample cools, moisture from the atmosphere condenses on the outside of the evaporating dish, before the mass is measured. The presence of the condensed moisture will the reported TDS in the water sample. O leave unchanged decrease double O half O increase
How can you tell that a compound is impure? (or pure?) What are the characteristics considered when taking a melting point? What is recrystallization? What is happening on a molecular level (videos are provided) How are solvents chosen for recrystallization? (single solvent or mixed-solvent system).What are the properties of a good solvent system? How are crystals collected?