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Briefly discuss how to identify the unknown compound by using mixed melting point method.
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- What are some reasons why the melting point might be lower than the literature value? (Hint: Assume all solvent was removed from the recovered compounds)Propose an efficient separation and recovery scheme for a mixture of toluene, benzoic acid, andaniline. Consider that steam distillation is not an option.Propose an extraction flowchart capable of separating this compound into its pure form
- In which case you would used a mic solvent recrystallization? Explain, give an exampleestimate the composition of these initial samples of distillate using figure 1. Based on the results what conclusion can you draw regarding the relative efficiencies of the two separations?What is the structure and IUPAC name of atrazine? The herbicide simazine is more polar than atrazine. In reverse phase chromatography of a solution containing a mixture of the two substances, which would elute first? Explain why this is in terms of partition. The instrument used in this practical exercise has a UV spectrophotometer as a detector. Give two other types of chromatographic detectors that might be used.
- What is the effect of weighing a recrystallized organic solid which is not completely dried to the percentage yield? Elaborate.What would you expect the melting point range of the recrystallized caffeine sample. Why would it have that melting point range?propose experimental design on the separation of components of the mixture of benzoic acid and benzaldehyde. Provide designed experiment and a schematic diagram of the step-by-step procedure.
- 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.Outline a method from Chronology, recrystalation and liquid to liquid extraction for how you would separate a solution of the three molecules above in ethyl acetate. Explain your rationale with finding the pKa levelExplain why aqueous permanganate must be freshly standardised before use in the experiment Determination of sodium percarbonate in a commercial detergent .