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What is the definition of acid?

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Acids and bases where traditional considered as substances that when dissolved in water increase the concentration of H+ and OH- ions respectively. This is the so called "Arrhenius" definition.
User Csuki
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A chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus red; typically a corrosive or sour tasting liquid of this kind
User Psisoyev
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