ABSTRACT
Source pH value is the best indication of the presence of acid or alkali in the water sample. Due to hydrolysis of dissolved salts, the pH value can decrease or increase beyond neutral value, i.e., 7.0, showing the presence of acid or alkali in the solution. The presence of salts of strong base and weak acid, e.g., Na2CO3 increases pH value; salts of weak base and strong acid, e.g., CaCl2 decrease pH level. Thus, a fundamental relationship exists among pH, acidity, and alkalinity.
