Same chapter3 marksDifficulty: Medium
State one use of sulphuric acid in each of three different industries.
Study of Compounds: Sulphuric Acid
3 marksDifficulty: Medium
Why must concentrated sulphuric acid always be added to water and never water to the acid?
Original Khojo Papers practice question — not from a past board paper.
Answer
The dilution of concentrated sulphuric acid is strongly exothermic. Adding water to the acid releases so much heat in a small volume that the water boils instantly and can spray the acid out of the vessel. Adding the acid slowly to a large volume of water, with stirring, spreads the heat through the water and keeps the mixture safe.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The vessel should also be cooled while the acid is added.
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