"pH" means a measure of the acidity or basicity of an aqueous solution, expressed in standard units. Theoretically pH equals the negative logarithm (base-10) cH, where cH is the concentration of hydrogen ions in grams per liter. Scale ranges from 0 to 14, pH 7 being neutral, less than 7, acidic, more than 7, basic. (Ord. 68-11, 2011)