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Study of Compounds-I Hydrogen Chloride — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryStudy of Compounds-I Hydrogen Chloride2 Marks
Question
Give reason for the following:
Dilute hydrochloric acid cannot be concentrated by distilling (boiling) the dilute acid.
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Answer

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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