Why is sulphuric acid not used for laboratory preparation of hydrogen?
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Dilute sulphuric acid will react to produce hydrogen gas.
Increasing the concentration will increase the rate of reaction.
Since the product is in another phase (hydrogen is a gas) too rapid a reaction brings a risk of overpressurization and explosion. (This was once an issue with car batteries).
Also rapid generation of hydrogen bubbles could splash concentrated acid onto onlookers or sensitive equipment.
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Sulphuric acid is used, and also hydrochloric acid
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