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Why is filtration of a gelatinous precipitate done while the solution is still hot?
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- Why is recrystallization not applicable to samples which contain large amount of impurities?What is the function of a desiccant in a set-up of volatilization gravimetry? To remove nitrogen from the sample To remove sulfuric acid from the sample To remove water vapor from the sample To remove carbon dioxide from the sampleWhat is the problem with using a solvent with a very high boiling point for recrystallization?
- More polar molecules move more slowly through silica than less polar molecules. Why is silica gel chromatography a good method of separating methyl orange from biphenyl?What is another factor that can influence fractional distillation’s success other than the number of theoretical plates?When isolating a solid compound after recrystallization, which is the appropriate technique to use, vacuum filtration or gravity filtration?
- write the principle of gas chromatography? write application of gas chromatography? how it is different from normal chromatographyBriefly explain why crystals form as the solvent cools during recrystallization.How can you prepare a set of solutions with concentrations spanning several orders of magnitudes? a. serial dilution b. crystallization c. dehydration d. high-performance liquid chromatography