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Why conc. sulphuric acid is always dilut...

Why conc. sulphuric acid is always diluted by adding sulphuric acid to water with constant stirring and not water to the acid ?

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Conc. `H_2 SO_4` has a great affinity for water and the process is exothermic.
Conc. `H_2 SO_4 + nH_2 O to H_2 SO_4 n H_2 O `+ Heat
If some water is added to conc `H_2 SO_4`, the heat produced vapourises a part of the water added, thus scattering conc. `H_2 SO_4` all around, which can be very dangerous. On the other had when some conc. `H_2 SO_4` is added to water now present, nor the conc `H_2 SO_4`, whose boiling point is very high. Further a constant stirring helps in intermixing the hot and cold solutions thus avoding a localised region of high temperature.
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BETTER CHOICE PUBLICATION-THE P-BLOCK ELEMENTS-QUESTION BANK
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