The Arrhenius Acid-Base Definition
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The Arrhenius definition names an acid as a substance raising hydrogen ion concentration in water, a base as one raising hydroxide ion concentration in water.
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HCl dissolving releases H+, an Arrhenius acid; NaOH dissolving releases OH−, an Arrhenius base.
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This definition only works in water, leaving familiar bases like ammonia unclassified by its wording alone.