While preparing dil. Sulphuric acid from conc.Sulphuric acid in lab.The conc. Sulphuric acid is added slowly to water with constant stirring?
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Con H2SO4 is highly hygroscopic - means it snatches away water molecules wherever it is present. Such a dehydrating tendency of con H2SO4 is so much that it chars carbohydrates.
When water is added to conc H2SO4, the first drop of water when touches H2SO4 then all molecules of H2SO4 rush to avail the water drop. This causes sprinkling of the acid and causes accidents. Conversely when conc H2SO4 is added to water then the presence of plenty of H2O molecules easily quench the water need of H2SO4 and hence sprinkling is avoided if added with continous stirring.
When water is added to conc H2SO4, the first drop of water when touches H2SO4 then all molecules of H2SO4 rush to avail the water drop. This causes sprinkling of the acid and causes accidents. Conversely when conc H2SO4 is added to water then the presence of plenty of H2O molecules easily quench the water need of H2SO4 and hence sprinkling is avoided if added with continous stirring.
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Answer:
If water is added to a concentrated acid, the heat generated
may cause the mixture to splash out and cause burns. The glass container may also
break due to excessive local heating.
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