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The melting-point capillary of a white crystalline substance is left to cool. The same capillary shows a substantially higher melting point of 145°C. Repeated recrystallization produces sharp melting points of about 114°C. Explain the behavior of a cooled and remelted sample.
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- List and describe two methods that can used to improve the separation of a liquid mixture by fractional distillationCompare the simple distillation of pure hexane and binary mixture of hexane and toluene to that of a fractional distillation?Briefly explain how slow cooling contributes to the formation of pure crystals during recrystallization.
- 1. What limitations are encountered in the application of sublimation as a general method of purification? 2.Explain how a process of fractional sublimation might be applied to a mixture of two substances which sublime closely together.Filter paper is usually a poor material on which to powder a solid sample before introducing it into a capillary melting-point tube because small particles of paper may end up in the tube along with the sample. Why is this undesirable? and how might the presence of paper in the sample make the melting-point determination difficultIf acetone is miscible with both water and xylene, then why can’t all three form a clear single phase mixture?
- When performing arecrystallization, slocent with a boiling point less must be use than the melting point of the compound being recrystallized. For benzil ( m.p.94-95C) which solvent would be best for this recrystallization? toluene (b.p. 110C) H2O (b.p.100 C) ethane( bo -98) methanol(bp64.7)What is the normal boiling point of this solvent?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 sample
- Re: recrystallization Before packing into a capillary tube, a solid substance has to be powdered. Why is this done on a watch glass rather than on a piece of filter paper?Why does the temperature not change while the pure cyclohexane is freezing? This question is based on the molar mass determination by freezing point depression and cyclohexane was the solvent.In a recrystallisation, why are the newly formed crystals washed with cold solvent? -To wash off any impurities that have crystallized on the surface of the pure crystals. -To wash off the film of solvent which contains the impurities. -To cool down the crystals. -To slightly dissolve the crystals to give them a more rounded shape.