In fractional distillation, sometimes, after all of the first liquid (liquid with a lower boiling point)...
In fractional distillation, sometimes, after all of the first liquid (liquid with a lower boiling point) has been collected, a small dip in temperature is observed before the temperature begins to rise again. Rationalize this observation.
Homework Answers
Solution:
In a fractional distillation, when lower boiling liquid is "distilling off," the temperature at the head remains equal to the boiling point
of that boiling liquid, therefore, the temperature of the pot is also constant. After the complete collection of first liquid, the pot
temperature increases until the next compound begins to boil off. During this period of time, vapors do not reach the
thermometer and the temperature drops slightly. When a second compound starts to boil, its vapor will reach the head of the
thermometer again, and the temperature will further begins to rise again.
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thank you!!
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