You need to recrystallize compound A. You are given several solvents to choose from. Briefly describe an experiment to determine what solvent is the best choice to recrystallize compound A.
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- Suppose you were trying to find a solvent for a recrystallization of each compound below. You did one test with a solvent, and get the results stated – from the table of solvents on the right, what would your next likely solvent to try be? Be sure to explain your answer. (a) DDT (shown below) is very soluble in ether at room temperature (b) glucosamine (shown below) does not dissolve in even hot isopropanolIn the Separating Acids and Neutral Compounds by Solvent Extraction experiment, why was sodium sulfate added to the tert-butyl methyl ether layer ? Group of answer choices to acidify the compounds to deprotonate the compounds to precipitate the compounds to remove traces of watergive at least three characteristics of dichloromethane that make it a good extracting solvent for alkaloid
- Suppose you took your two compounds, dissolved them in tertbutyl methyl ether and then added them to a separatory funnel. Now suppose you add in aqueous sodium bicarbonate and vigorusly shake the contents of the separatory funnel. ethanol will be dissolved in tert butyl methyl ether ether and valeric acid will be dissolved in the aqueous sodium bicarbonate layer. Draw the EXACT chemical structure that will exist in each of the layers after shaking with sodium bicarbonate. (Is it neutral or charged?)Why is it more difficult to recrystallize benzil when using hexane as a solvent instead of ethanol?Which is the structure of the substance which is important in the detoxification mechanism of benzoic acid?
- Look up the structures and melting points for acetanilide and salicylic acid.Predict whether the rate of cooling during a recrystallization process will have any effect on thepurity of the crystals formed.1. The substance to be analyzed – is white, highly soluble in water salt. Flame coloration test gives weakly-violet color. Mixing of salt water solution with chlorine water in presence of trichloromethane changes of color of organic layer to raspberry-reddish-violet. What kind of substance is this? Explain you answer, provide chemical equationsWhy was it important to use a basic aqueous solution as the solvent for fluorescein? Consider both solubility issues and optical properties in your answer.
- Assuming you are a chemist and you need to extract ethanolic acid in a benzene solution. Propose and briefly discuss how to extract the ethanolic acid in the benzene solution. Include the reactions involved in each step, if any.(a) Why is an ethanol/water mixture used as the solvent rather than just water? (b) Why does the soap precipitate when the reaction mixture is mixed with salt water? (c) Did your soap become sudsy when you washed your glassware? Compare it to dish soap and body soap.¨ Aspirin is an ester and undergoes the typical reaction of esters. Write a mechanism for the reaction. Taking this in mind, why should you not recrystallize aspirin from hot water?
