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Question
What is the action of conc. sulphuric acid on potassium nitrate?
Short Answer
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Solution
When solid potassium nitrate (KNO3) is heated with concentrated sulphuric acid below 200°C, it forms potassium hydrogen sulphate and evolves volatile nitric acid (HNO3) vapours.
\[\ce{KNO3 + H2SO4 (conc.) ->[< 200°C] KHSO4 + HNO3 ^}\]
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