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why does the observed meltin point change over the course of distillation
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- List and describe two methods that can used to improve the separation of a liquid mixture by fractional distillationCompare simple and fractional distillation for the separation of HEXANE and TOLUENEin fractional distillation, how do you tell which liquid is in which fraction and which fraction has a mix of liquids if you are trying to seperate cyclohexane and toluene?? what would the density and boiling point of the first fraction be
- What are azeotropes, and how do they affect a distillation process? Azeotropic distillation is a process that can be used to separate azeotropes from other feed components. Discuss using a suitable example how this method can be applied to separate azeotropes during a distillation process.You were given a mixture of two miscible solvent A and B that you are tasked to separate. You know that solvent A has a boiling point of 49 oC while solvent B has a boiling point of 174 oC. Which of the listed method would overall be the most efficient? Fractional distillation Recrystallization Solid-liquid extraction Liquid-liquid extraction Simple distillation Acid-Base extractionWhy is fractional distillation more efficient than simple distillation when purifying liquid mixtures?
- How can the temperature and the vapour pressure in a fractional distillation be effectively controlledCan a mixture of trichloromethane and propanone be separated into the pure components by fractional distillation? ExplainDescribe in words and by means of complete chemical equations, how a mixture of 1.25 g of benzoic acid tertbutylbenzene can be separated by applying the separation of 2 components by liquid-liquid extraction.
- Fractional distillation of a binary mixture leaves behind a liquid consisting of both components. The composition of this liquid does not change as it is boiled. Provide an explanation for this observation.What parameters should be considered when choosing between distillation methods? Are there any differences in equipment or technique?3. A pure white crystalline compound was found to melt at 131.5-132.0°C when taken on a melting point apparatus, and on further heating, the liquid was found to start bubbling at ca. 155-160 °C. The capillary containing the melted compound was set aside to cool, and resolidify. When the sample was retried using that same capillary, the sample melted at 120.6-154.5°C, along with some bubbling. What is the cause of the bubbles? Why is the melting point so wide the second time? Explain by stating what you have learned in this laboratory about melting points.