when weak base and strong acid are mixed then what happened
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when a strong acid reacts with a strong base,when H3O+ and OH- are present in equivalent amount then salt and water is formed,solution becomes neutral and 57 kj per mole energy is evolved.
Eg: NaOH +HCl=NaCl+H2O
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When Weak base reacts with strong acid
For eg :- NH3 + HCl ———> NH4Cl
The NH4Cl ionises to form NH4+ and Cl-
The cation formed (NH4+) undergo hydrolysis as follows.
NH4+ + H2O ——> NH4OH + H+
Being weak base NH4OH is partially ionises and the solution contain greater concentration of H+ ions. Hence the solution becomes ACIDIC.
The solution becomes ACIDIC due to CATION HYDROLYSIS and hence the pH is less than 7.
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