Logarithmic measure of hydrogen-ion activity: pH = -log₁₀ a_{H⁺}. Neutral water at 25 °C has pH 7.00. Convenient operational handle on acid-base chemistry.
Logarithmic measure of hydrogen-ion activity: pH = -log₁₀ a_{H⁺}. Neutral water at 25 °C has pH 7.00. Convenient operational handle on acid-base chemistry.