What limitation of the Arrhenius theory is highlighted by the behavior of ammonia ($ ext{NH}_3$)?
Answer
It fails to explain why ammonia, lacking a hydroxyl group, acts as a base.
The Arrhenius theory restricts the definition to substances increasing $\text{H}^+$ or $\text{OH}^-$ concentrations in water. It cannot account for bases like ammonia ($ ext{NH}_3$) which do not contain a hydroxyl group.
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