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Question
In the preparation of nitric acid from KNO3 concentrated sulphuric acid is used in place of hydrochloric acid. Why?
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Solution
Concentrated sulphuric acid is used in place of hydrochloric acid because hydrochloric acid is a volatile acid. If used, the nitric acid vapours will carry HCl vapours along with them, making it impossible to get pure nitric acid. Therefore, a non-volatile acid like concentrated sulphuric acid is required.
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