Question

5. a) How many vaporization-condensation events are there in each? (4pt) Choices: zero ; one ; more than one i) a simple distillation ii) a fractional distillation b) In theory, which method above should give a better separation of two liquids with bp <100°C difference? 6. State what is wrong with the setup in each of the following pictures? (6pt) Water out Water in Water out Water in Substance to be distilled

Answer 1

5. A.1. Simple distillation -one

2. Fractional distillation-more than one

5B. Fractional distillation will give better separation

5. Distillation is a purification process. . It involves Vaporization of the liquid by heating and further condensation to obtain the pure Component in collecting flask. the vaporization is dependent on boiling temperatune of liquid o Simple distillation, has only one zaposization and Condensation event called theoretical plate". (ii) Fractional column has a different assembly than Simple clistillchon. It consists of fractionating column". Consequently Vaporization and Conden Sation events takes place more than one time As the vapor ascends in column, it encounters Cooler area and sendenses. Hot vapour revaponze this condensed liquid and travels up the Column, are for two liquids having boiling point less than 100e, simple clistillation is incapable of purification properly. Hence insertion of fractionating Column (fractional distillations) is required This is because higher number of theoretical. plates (Vaporization - Condensation events) in fractional distillation. Consequently density of low boiling liquid will be high in vapor phase and Separated. Koson