please answer all questions for points. thanks in advance friends!!!!!!! 1. Expl
ID: 845868 • Letter: P
Question
please answer all questions for points. thanks in advance friends!!!!!!!
1. Explain what happens to the vapor pressure of a liquid as temperature increases. Are temperature and vapor pressure directly proportional? If not, explain the relationship by drawing a graph. (2 points) 2. How can the use of a very long fractionating column affect the overall efficiency of a separation of two solvents? Would a very long fractionating column increase or decrease column hold-up? (2 points) 3. How admixture of water affects refractive index of ethanol? (1 point) 4. Is refractive index increase or decrease with temperature? (1 point)Explanation / Answer
Vapor pressure is pressure exerted by the vapor (which is in thermodynamic equilibrium with its liquid or solid) at given temperature. For liquids, vapor pressure increases with increase in temperature due to increase in kinetic energy of the molecules. In fractionating columns of long length, liquid can be enriched more and thus leads to high efficiency of separation. The hold-up is amount of liquid required to wet the packing in the column, for an efficient column the hold-up should be low. As the refractive index of water is lower than that of ethanol, addition of water to ethanol reduces the refractive index of ethanol. Refractive index of liquids decrease with increase in temperature, but the relation is non linear.
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