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Explain about the hydrolysis of salt of strong acid and weak base. Derive Kh and pH for that solution.

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1. Consider a reaction between strong acid HCl and a weak base NH4OH to produce a salt NH4CI and water

2. NH4 is a strong conjugate acid of the weak base NH4OH and it has a tendency to react with OH- from water to produce unionised NH4 as below,

3. There is no such tendency shown by Cl- and therefore [H+] > [OH-] the solution is acidic and the pH is less than 7. 

4. In the salt hydrolysis of strong base and weak acid, we have to derive a relationship between Kh and Kb as Kh . Kb = Kw

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