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

Question:

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

Solution:

In steam distillation, the organic liquid starts to boil when the sum of vapour pressure due to the organic liquid $\left(p_{1}\right)$ and the vapour pressure due to water $\left(p_{2}\right)$ becomes equal to atmospheric pressure $(p)$, that is, $p=p_{1}+p_{2}$

Since \$p_{1}