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- A student is asked to prepare 45.0 mg of a sample to be used in a mixed melting point test. The requested composition of the sample is 65.0 % A and 35.0 % B. What is the mass of compound A needed to prepare the sample?Describe the errors which may cause an observed melting point range of a PURE sample to be: higher than the correct melting point broad in rangeWhat 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
- 1. A pure compound has a melting point of 102-103°C. Predictthe general effect on the melting point whena small amount of an impurity with a melting point of 212-214°C is added to the compound.Why is fractional distillation more efficient than simple distillation when purifying liquid mixtures?Write the dispersion medium and dispersed phase in milk.
- What effect does the presence of impurity have on the melting point? Can the amount of impurity be quantified by melting point determination?Briefly explain how slow cooling contributes to the formation of pure crystals during recrystallization.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)
- explain how mixed melting point determination can be used to identify a solid compound.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.What is another factor that can influence fractional distillation’s success other than the number of theoretical plates?