A solution has [H⁺] = 10⁻⁴ M. Its pH is:

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pH = -log[H⁺] = -log(10⁻⁴) = 4. The solution is acidic. pOH = 14 - pH = 10, so [OH⁻] = 10⁻¹⁰ M. pH scale ranges 0-14 (typically). pH < 7 acidic, pH = 7 neutral, pH > 7 basic. Pure water has [H⁺] = 10⁻⁷ M, pH=7.

A solution has [H⁺] = 10⁻⁴ M. Its pH is: MCQ with Answer and Explanation

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