Question

Liquid ‘A’ has a boiling point of 353 K and liquid ‘B’ has a boiling point of 384K. Both are
miscible with each other. They are separated by “fractional distillation”. Justify the reason
for using fractional distillation method

TNSCERT Class 9 General Science Ch3 Is Matter Around us Pure

Answer 1

First of all the physical properties of the liquids are unknown except that both liquids are miscible. Therefore the method of separation must be fractional distillation.

Answer 2

Answer:

First of all, both liquids are miscible, but their physical properties are unknown. As a result, fractional distillation is the best method for separation.

• A fractional distillation is the process of separating miscible liquids during a distillation process. In this process, the mixture is usually distilled and condensed repeatedly before being separated into its components. A specific temperature causes fractions of the mixture to start vaporizing when the mixture is heated.

• A liquid mixture's vapour composition is normally not equal to its liquid composition. Heat causes the liquid with a lower boiling point to boil and turn into vapour.

• In comparison with the liquid component, the more volatile component stays in a vapor state for a longer period of time. It usually involves repeated distillations and condensations, and the mixture is separated into its constituent parts.

• In a vapour state, the more volatile components increase, and in a liquid state, the more volatile components increase.

In distillation, vapor is converted into liquid by condensation (liquefaction). In the liquid state, a more volatile component will remain in a pure state when this distillation process is repeated. As a result of fractional distillation, components of a liquid-liquid mixture can be separated.

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