First slide
Salt hydrolysis :
Question

pH of 0.1M Ammonium acetate solution at 298 K  is 7.02. At 298 K, pH of ‘X’ M  Ammonium acetate solution is 7.02. Value of X is

Difficult
Solution

CH3COONH4 is a salt of WA-WB;

pH of a salt of WA- WB  is independent of concentration of the salt;

pH of a salt of WA-WB depends on Ka of  weak acid and Kb of weak base only;

pH=7+12pKa-12pKb;

Thus pHremains 7.02 at any concentration;

 

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