Chemistry
Why is water not added to concentrated H2SO4 in order to dilute it?
Sulphuric Acid
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Answer
Water is never poured on concentrated H2SO4 to dilute it as large amount of heat is evolved which changes poured water to steam. The steam so formed causes spurting of acid which can cause burn injuries, so dilution is done by pouring acid on a given amount of water in a controlled manner by continuous stirring, else acid being heavier will settle down. The evolved heat is dissipated in the water itself and hence the spurting of the acid is minimized.
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Related Questions
Copy and complete the following table:
Column 1
Substance reacted with acidColumn 2
Dilute or concentrated acidColumn 3
GasHydrogen Carbon dioxide Only chlorine Give reasons for the following.
(a) Sulphuric acid forms two types of salts with NaOH.
(b) A piece of wood becomes black when concentrated sulphuric acid is poured on it.
(c) Brisk effervescence is seen when oil of vitriol is added to sodium carbonate.
Why is:
(a) Concentrated sulphuric acid kept in air-tight bottles?
(b) H2SO4 is not used as a drying agent for H2S?
(c) Sulphuric acid used in the preparation of HCl and HNO3? Give equations in both cases.
State your observation when –
(a) Sugar crystals are added to a hard glass test tube containing conc. sulphuric acid.
(b) Conc. H2SO4 is added to a crystal of hydrated copper sulphate.