Water in d presence of a stronger acid acts as a base (as per Bronsted concept) i.e it accepts a H⁺ , while in d presence of a stronger base, it acts as an acid (4m Bronsted concept) i.e gives a H⁺



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with NH3 it acts as an acid

NH3 + H2O ---------> +

with H2S it acts as a base

H2S + H2O --------->

this is because, it undergoes ionization to give and ions

water can also act as acid and as a base