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Ammonia acts like a base because of these two reasons:
it combines with H+ ions
it increases OH- concentration

Answer: It combines with H+ions.

Explanation: It combines with H+ions.

Ammonia releases \(OH^-\) ions.

According to Arrhenius concept, a base is defined as a substance which donates hydroxide ions \((OH^-)\) when dissolved in water and an acid is defined as a substance which donates hydronium ions \((H_3O^+)\) in water.

According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons and a base is defined as a substance which accepts protons.

According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.

\(NH_3+H^+\rightarrow NH_4^+\)

\(NH_4OH(aq)\rightarrow NH_4^++OH^-\)

Ammonia being a lewis base donates lone pair of electrons and thus combines with \(H^+\). Also aqueous solution of ammonia gives \(OH^-\) ions in water, thus act as Arrhenius base.

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