5. Why is GC separation more efficient than a fractional distillation? (3 pts)
Why does fractional distillation result in more pure products but lower yields? Can simple or fractional distillation result in distillation of pure ethanol? Explain.
Pre-lab questions 1. What is the basis for separation of compounds using distillation? Why is it possible to separate ethanol from water using distillation? 2. What is the difference between simple and fractional distillation? Why does fractional distillation give a much better separation of substances? 3. When is vacuum distillation used, and why is it used? 4. What is an azeotrope? How does this apply to the separation we are doing in this experiment? 5. What intermolecular forces are being...
Why the Boiling point of the aqueous Methanol in a fractional distillation is higher than the boling point of the pure Methanol
m m Liege Ammerman Campus. Department of Physical Science 2. During a fractional distillation, why is a better separation achieved when heat mation, why is a better separation achieved when heat is applied slowly and steadily? (2 pts) 3. Con Consider heating a pure substance, such as acetone, to its boiling point. Why doesn't all the acetone vaporize instantly when the boiling point is reached? Hint: think about the heat of vaporization. (1 pt) 4. Why is it preferable to...
1) Why is the column packing material used in the fractional distillation column? 2) What should be the characteristic features of an ideal column packing material? 3) Two fractional distillations are run with identical mixed samples of two liquids using different columns. In apparatus A, the column is 15 em long, and in apparatus B, the column is 25 cm long. Will one apparatus provide any better separation of the mixture then the other? If so which one and why?...
4. What could be done to improve the separation of components in the most efficient distillation? Suggest at least two ways and be specific. (4 pts)
2. Explain why the vacuum distillation has more advantage than the simple distillation? 3. Give two examples of materials that can be purified by steam distillation. 4. What are the first and second yellow solids in this experiment?
Questions about distillation: Titration Data - Fractional Distillation -Simple Distillation - Temperature (Celsius) -- -- --- --- --- --- -- --- -- --- B.P. methanol = 65C B.P. ethanol = 78C 0 0 0 0 0 0 0 0 0 15 Volume (ml) 1. Why does the fractional distillation show no change in temperature while the system is heated and approximately 20mL is distilled? What is occurring when the temperature increases rapidly at about 25ml? 2. At 70°C, the vapour...
Why is HETP important? Why not just use theoretical plates to measure the efficiency of a fractional distillation head?
5. Distillation: how does it work, differences between simple and fractional distillation. 6. Crystallization: how to choose solvent, how to crystallize substance. Vacuum filtration. 7. Extraction: how to predict which layer is organic and which is aqueous, how to separate neutral compound from acidic/basic compound. 8. Chromatography: basic principles, various techniques (TLC, column, GC), connection between polarity of substance, polarity of solvent and R 9. Mechanisms: S1, S,2, elimintaion of water from alcohols (keep in mind than several products are...