Boiling of dilute HCl acid does not increase its concentration beyond 22 percent because HCl acid:
Correct answer: C. Forms boiling mixture
- A. Is very volatile
- B. Highly soluble in water
- C. Forms boiling mixture
- D. Forms saturated at this concentration
Explanation
When the concentration of HCl gas in water is 22.2% by weight, it forms a constant boiling mixture.At this concentration, if dilute HCl is heated then water and HCl vaporises in the same proportion by weight.Hence dilute hydrochloric acid cannot be diluted.
This question appeared on the NUMS 2015 paper, which you can sit online with every answer explained.
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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