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Question
Give reason for the following:
Dilute hydrochloric acid cannot be concentrated by distilling (boiling) the dilute acid.
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Solution
Dilute hydrochloric acid cannot be concentrated beyond 22.2% (by weight) by distillation.This is due to the fact that this mixture (77.8% water+22.2% HCI) is an azeotropic mixture, it boils at a constant temperature of 110°C without any change in concentration.
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