WHY Ph of acide depends upon hydrogen ions why not other ions

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Solution

All the acid furnish H⁺ ion in solution. So, H⁺ ion is common to all the acids. More over reactivity of an acid is reactivity of H⁺ ions only. Like in neutralizations of acid and base , there is reaction between H⁺ ion and OH^- ions. Therefore pH of acid is explained in term of H⁺ concentration as follows:
pH = - log[H⁺]

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