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- complete the table Procedure Preheat the hotplate stirrer with an aluminum block to 45–50 °C (do not exceed 55 °C). To a clean 5-mL conical vial equipped with a Teflon-coated magnetic stir vane, add 4- bromo-nitrobenzene (152 mg, 0.750 mmol, 1 equiv) and THF (150 μL). Cap the vial and stir the mixture at 45–50 °C for about 30 s to partially dissolve the substrate; don’t stir too fast to avoid splashing the contents on the walls of the vial. Add ammonium chloride (120 mg, 2.2 mmol, 3 equiv), carbonyl iron powder (CIP; 210 mg, 3.80 mmol, 5 equiv), the solution of TPGS-750-M (2% in water, 1.5 mL), and 1 drop of concentrated HCl. Cap the vial and place it on the hot plate stirrer, stirring at 45–50 °C. While the reaction mixture is stirring, prepare an approximate 2% solution of the reactant in DCM (1 sample per 3–4 students) by dissolving 10–15 mg of 4-bromo-nitrobenzene in 0.5 mL of methylene chloride. Prepare the solvent mixture for the mobile phase (25% ethyl…Give the proper explanation of the correct option and explanation of the incorrect options will upvote No need to upload any imageA piece of filter paper is placed in the TLC developing chamber to: Choose one: provide a lining for the TLC plate to rest on. help the chamber saturate with the developing solvent's vapor. make it easier to visualize the solvent front level. protect the TLC plate.
- A cellulose sponge, 7.0cm x 12cm x 2.5cm, weights 12.0 grams. Calculate the specific gravity of the sponge.After you collect a fraction from the column, how do you remove the solvent to get the pure compound? Take a melting point Recrystallize it from the solvent it is dissolved in Evaporate the solvent on a rotary evaporator (rotovap). Run a TLC plate. A pure compound will have only one spotHow 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?
- (a) Give three examples of applications where a solid lubricant would be preferable to a liquid lubricant. For each example, explain the advantages of using a solid lubricant and suggest one suitable candidate giving reasons for your suggestion.What specimens and procedures require a chain of custody form? Put in a table with explanation.How can you remove insoluble impurities during a recrystallization? options: 1-Hot gravity filtration. 2- Vacuum filtration 3- It is not possible.You should choose another separation method. 4- Pick out the impurities with tweezers.