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An azeotropic mixture formed by hydrochloric acid and water contains what percentage of HCl?

1. 48% HCl
2. 22.2% HCl
3. 36% HCl
4. 20.2% HCl

Correct answer: 20.2% HCl

Solution

The correct option is 20.2% HCl because this is the specific concentration at which hydrochloric acid and water form an azeotropic mixture, meaning that this composition cannot be separated by simple distillation.

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