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Question
Explain, why (or give reasons for)
Hydrochloric acid cannot be concentrated above 22.2% by boiling.
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Solution
Hydrochloric acid cannot be concentrated over 22.2% by boiling because this mixture(77.8% water + 22.2% HCI) boils at a constant temperature of 110°C without any change in concentration. Such a mixture is called as azeotrope.
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