According to the Arrhenius concept, the strength of an acid depends upon the H⁺ ions furnished by the acid.
According to the Arrhenius theory, acids are those substance which will give H⁺ ion in an aqueous solution.
And acidity of any substance will be calculated by using the pH value which can be calculated as pH = -log[H⁺].
Hence H⁺ ions furnished by the acid is used to define the strength of Arrhenius acid.
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