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Liquefaction of Gases and Critical Constants

Explain, why ...

Question

Explain, why an organic liquid vaporises at a temperature below its boiling point in its steam distillation?

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Solution

In steam distillation, the organic liquid starts to boil when the sum of vapour pressure due to the organic liquid (p₁) and the vapour pressure due to water (p₂) becomes equal to atmospheric pressure (p), that is, p = p₁ + p₂

Since p₁ < p₂, organic liquid will vapourise at a lower temperature than its boiling point.

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Explain, why an organic liquid vaporises at a temperature below its boiling point in its steam distillation?

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Liquefaction of Gases and Critical Constants

Standard XII Chemistry

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