0.1 M NH4Cl is the salt of weak base strong acid, NH4OH weak base and HCl strong acid . when take the aqueous solution of this salt is acidic in nature due to HCl.
In case of CH3COONa salt . strong base (NaOH)and weak acid (CH3COOH) .when take aqueous solution of this salt solution is basic due to NaOH .
So that aqueous solution of NH4Cl has lower PH
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