NH4OH is a weak base but
HCl is a strong acid in solution, so
pH of
NH4Cl solution is comparatively low.
NaNO3 is a salt of strong base and strong acid, so
pH of the solution will be 7 .
Hydrolysis of potassium acetate (a salt of a weak acid and a strong alkali) gives a weakly alkaline solution, since the acetate ion acts as a weak base.
CH3COOK+H2O→CH3COOH+K++OH−
The pH of this solution
≈8.8.
Hydrolysis of sodium carbonate (a salt of strong alkali and a weak acid) gives an alkaline solution
Na2CO3+2H2O→2(Na++OH−)+H2CO3
The pH of this solution is
>10.