EXERCISE 2 Flashcards
involves the process of separating two or more liquids homogenously mixed but with different boiling points
(at least 20C difference)
simple distillation
SIMPLE DISTILLATION
when the mixture of liquids to be distilled is heated, which will vaporize first
liquid w lowest boiling point
SIMPLE DISTILLATION
the temperature within the apparatus will continue to ____ until the boiling point of the other liquid left at the distilling flask
increase
SIMPLE DISTILLATION
indication that everything is already evaporated/vaporized
sudden drop of temperature
SIMPLE DISTILLATION
what do you call the liquid that has been collected
distillate
- small, insoluble, porous stones made of calcium carbonate or silicon carbide
- have pores inside which provide cavities both to trap air and to provide spaces where bubbles of solvent vapor can form
BOILING CHIPS
boiling chip ensure ____ and prevent ____ and boiling over and loss of solution
ensure even boiling
prevent bumping
the bulb of the thermometer should be placed ____ of the distillation flask
right below the side arm
why do we put the bulb of the thermometer right below the side arm of the distillation flask
to get an accurate measurement
SIMPLE DISTILLATION
as the solution starts to boil, the liquid with ____ turns to vapors first
lowest boiling point
SIMPLE DISTILLATION
the vapor would then be condensed back into liquid inside the condenser, which will then be collected as the ____
distillate
a different type of distillation which utilizes the same tehcnique with simple distillation but repeated several times
fractional distillation
the application of distillation is limited to a certain extent due to the ____ when they are distilled at normal atmospheric pressure
decomposition of some organic compounds
the limitation in distillation can be resolved by ____, thus, lowering the boiling point of the substance
lowering the pressure
relationship of pressure and boiling point
directly proportional
the distillation rate should be maintained at ____
1-2 drops/sec
why do we need to discard the second distillate
bc it contains a mixture of both solvents
sample is impure
the gathered range of boiling point is recorded and compared to the ____ of the organic solvents
theoretical boiling point
BOILING POINT
diethyl ether
35C
BOILING POINT
ethyl acetate
77C
BOILING POINT
dichloromethane
40C
BOILING POINT
ethanol
78C
BOILING POINT
acetone
56C
BOILING POINT
n-butanol
117
