For this experiment, yield was not important, but in onsite lab, as well as large-scale processes, a good yield is crucial in the success of a purification step. In what ways do you think a high yield can be assured in recrystallization?
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Solved in 2 steps with 1 images
- Propose a extraction flowchart capable of seperating this mixture into its pure formA student forgot to add the mass of the unknown solute in trial 1 to the mass of the solute that was weighed for trial 2 and then added to the cyclohexane-solute solution used in trial 1. How would this omission affect the calculated molecular weight of the solute?On performing a tlc of the reaction product on a plate alongside pure benzophenone, a student observed two spots in their product, the stronger corresponding to the benzophenone. What conclusion can be drawn? What is the stationary phase on the tlc plate and why is it effective as a stationary phase?
- Based on the resulting chromatograms after visualization with iodine vapor, which between the solvent systems WHITE and MIX resulted in a more effective separation of the pigments of the indigo extract? Explain your answer in terms of the solvent that did not effectively separate the components of the root extract.In this experiment, you will be performing TLC on your 'crude' and 'recrystallized' biphenyl samples. How many spots would you expect to see in each lane? Explain your answer. 2. If you perform pipette (column) chromatography on the mixture containing biphenyl and organic dye, which compound would you expect to elute from the column last. Explain your answer.Some procedures include the addition of sodium carbonate before liquid-liquid extraction. What is the purpose of this step?
- Why is it necessary to determine the nature of sample (e.g. type of analyte/sample) before subjecting it to solvent extraction?The experiment wAs preformed using a recrystallization of salicylic acid. The IR was preformed using a KBR pellet method Re-state the diagnostic peaks from the results, this time with the intention of comparing the experimental to literature diagnostic values as well as fingerprint regions to provide evidence to answer your hypothesis. After comparing your values, you must discuss what conclusions you obtained (i.e. was there evidence to support that your compound is pure?)1. The heat flows measured in this experiment were actually not for the simple neutralization of a proton and hydroxide ion (as indicated in the Introduction for Choice Ill); rather they include contributions based on the fact that these species are hydrated in aqueous solution. What does it mean to say that a proton is hydrated, and how will the heat of hydration affect the measured heat flow for a neutralization reaction?
- Read the detailed procedure of an experiment in your screen. Evaluate each step in the procedure whether it belongs to HOMOGENIZATION, EXTRACTION, PURIFICATION/CONCENTRATION, DATA TREATMENT, or INSTRUMENTAL ANALYSIS step.What kind of sample cleanup does solid-phase extraction accomplish in the analysis of caffeine and theobromine in chocolate?Which of the following could DECREASE the amount of the recovered crystals in the purification by recrystallization experiment? Collecting the recrystallized benzoic acid by filtration using a pre-weighed filter paper. Using a long-stemmed funnel in the hot filtration step. Cooling the filtered solution rapidly. Washing the recovered crystals using hot solvent. a. II, III b. II, IV c. II, III, IV d. I, II, III, IV
