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بسم هللا الرحمن الرحيم Faculty of Pharmacy Mid Term Exam Qeshta Department of Chemistry. Organic Chemistry Lab. Instructor: Basem Name:………………………………………………………….group :……….. 1)Define the following :1-Boiling point of pure liquid …………………………………………………………………………………………………………… ……………………………………………………………………………………………………......... 2-Vapor pressure and atmospheric pressure …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… 3-Boiling chips …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… 4-Distillation …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… 5-Extraction …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… 6-Distribution coefficient equal 1 …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… 7-Thermal equilibrium condition …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… 8-Volatile liquids …………………………………………………………………………………………………………… 1 …………………………………………………………………………………………………………… 2)Answer the following 1 Why is fluted paper usually used when doing hot filtration during recrystallization? …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… 2) What is the purpose of recrystallizing a solid? …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… 3)How are soluble and insoluble impurities removed during recrystallization? …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… 4) Why is it recommended to use no more than the minimum amount of solvent than is necessary to dissolve the solid being recrystallized?. …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… 5) Why should the hot fltrate be allowed to cool slowly as the desired product recrystallizes? …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………. 6) If your experiment yield of acetanilide is greater than 100%, how could this occur? …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………. 7)What is the effect on the boiling point of a solution (e.g. water) produced by a soluble non-volatile substance (e.g. sodium chloride)? What is the effect an insoluble substance such as sand or charcoal? …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………. 8) Why is the conjugate base of benzoic acid more soluble in water than ether? …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… 2 3)solve the problems 1)If 5.0 g of compound X is dissolved in 100 mL of water and extracted with 100 mL of ether, calculate the amount of compound X that will be left in the water layer after the extraction. (Note: The Distribution coefficient for Compound X between ether and water is 2.5) 2)a-Calculate the vapor pressure of a solution containing 20mol % n-hexane and 80mol% n-octan at 90C assuming that Raults law is obeyed the vapor pressure for pure component, at 90C are the following n-hexane =1390 torr and n-octan =253 torr b) calculate the composition n-hexan and n-octan solution that boils at 90C. اجبي في الخلف ........................................................................................................................ مع تمنياتي لكم بالتفوق والنجاح باسم سالم قشطة.أ 3 4 5
