<span>A solution with a pH of 4 has ten times the concentration of H</span>⁺<span> present compared to a solution with a pH of 5. </span>pH <span>is a numeric scale for the acidity or basicity of an aqueous solution. It is the negative of the base 10 logarithm of the molar concentration of hydrogen ions. </span>[H⁺] = 10∧-pH. pH = 4 → [H⁺]₁ = 10⁻⁴ M = 0,0001 M. pH = 5 → [H⁺]₂ = 10⁻⁵ M = 0,00001 M. [H⁺]₁ / [H⁺]₂ = 0,0001 M / 0,00001 M. [H⁺]₁ / [H⁺]₂ = 10.
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