When a weak base is mixed with its salt, an alkaline buffer mixture is obtained.
For an alkaline buffer mixture, pH = 14-PKB + lg (Pine/SSOL)
RKB of ammonia = - lg Kb
Kb (NH4OH)=1,8∙10^-5
pH =14 + lg(1.8×10^-5) + lg (0.65 / 0.35) =9.5241=9.52
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