Assuming that the impurity has a higher boiling point (must be greater than 25-3
ID: 519865 • Letter: A
Question
Assuming that the impurity has a higher boiling point (must be greater than 25-30 degree C different than the solvent), the has a higher boiling point (must be greater than 25-30 degree C different than the solvent), the desired solvent can be separated by heating it to its vapor phase and then collecting the pure vapours in a receiver flask. Distillation involves heating a liquid to its boiling point. at atmospheric or reduced pressure to convert it to its vapour, and then condensing the vapour back into a liquid by cooling with a condenser and collecting the condensate in a receiving flask. Distillation involves heating a liquid to its boiling point to convert it to its vapor, and then converting the vapour back to liquid by icing the receiver flask. Boiling stones must be added to the distillation flask prior to heating. Why? In order to prevent the solution from 'bumping'. To avoid a sudden violent eruption of liquid should the solution already be hot when the stones are added. To promote smooth boiling of the solvent. all of the above. Analyze the following scenarios and choose where you are required to perform hot gravity filtration? colored impurities were present (therefore charcoal was added), and to remove soluble impurities. soluble impurities were present (therefore charcoal was added), and to remove insoluble impurities. colored impurities were present (therefore charcoal was and to remove added). And to remove insoluble impurities. to remove boiling stones that were added, and any soluble impurities. If too much solvent is used when making a saturated solution, the yield of crystals at the end of the recrystallization will be reduced. a. True b. False Pairs of liquids that will mix in all proportions are called liquids.Explanation / Answer
10.Boiling chips/stones are generally made from porous material like porcelain and silica.Being porous,there is trapped air inside these materials ,which upon heating the liquid gets released as stream of bubbles.These fine bubbles act as nuclei for the formation of vapour from the liquid thus preventing the formation of big bubbles and spurting of liquid.They also ensure a smooth boiling process.So the answer is D
11.Charcoal removes coloured impurities from a hot solution containing the desired material.So to remove the charcoal along with other insoluble impurities,hot gravity filtration is required.So answer is C.
12.Some material is still left behind in the solution phase even after crystals are formed.So more the amount of solvent,more will be the amount of sample left behind in solution which creates a loss of mass thus reducing the yield.So answer is TRUE(option a).
13.They are known as miscible liquids.