Question

Why is sulfuric acid used in the preparation of HCl and HNO3.

Answer 1

Because the concentrated acid has a fairly high boiling point, it can be used to release more volatile acids from their salts, e.g., when sodium chloride (NaCl), or common salt, is heated with concentrated sulfuric acid, hydrogen chloride gas, HCl, is evolved.

Answer 2

Hi.

Here is your answer----------

The sulphuric acid is used in the preparation of hydrogen chloride {HCl} and nitric acid {HNO3} because it is a non-volatile{ it has a high boiling point} and HCl and HNO3 are volatile acids. If any other acids which are volatile in nature is used instead of sulphuric acid, then HCl and HNO3 prepared will volatilize along with that acid.

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