Explain why dilute hydrochloric acid cannot be concentrated by bo… - Vidyadip

Question

Explain why dilute hydrochloric acid cannot be concentrated by boiling beyond 22.2%.

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Answer

A dilute aqueous solution of hydrochloric acid gets gradually concentrated on distillation, till the concentration of the acid reaches 22.2% HCl by weight which boils at 110°C. When
this concentration is reached, no further increase in concentration of the acid becomes possible by boiling. This is because vapours evolved before 110°C are vapours of water but at temperature above 110°C vapours consist mostly of molecules of HCl.

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