Ammonium hydroxide (NH4OH) is a base. The cation (NH4)+ is low acidic.
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it is an acidic salt due to NH4+ ions being weak acid (pKa=9.2)
NH4+ is NH3's conjugate acid. NH3 accepts H+ to become a Bronsted-Lowry base.
Dissolving in water = splitting in ionsCH3COONH4 --> CH3COO- + NH4+CH3COO-, acetate is a weak base: CH3COO- + H2O CH3COOH + OH-NH4+, ammonium is a weak acid: NH4+ + H2O NH3 + H3O+Totally in water: CH3COO- + NH4+ CH3COOH + NH3 and 2H2O H3O+ + OH-
The formic acid is a weak acid.
Citric acid is considered to be a weak acid.