pH is a measure of the concentration of protons (H+) in a solution and, in effect, its acidity or alkalinity. The p stands for the German “Potenz”, meaning power or concentration, and the H for the hydrogen ion (H+). In layman’s terms , the “pH” value is an approximate number between 0 and 14 that indicates whether a solution is acidic (below pH 7), basic (above pH 7) or neutral (pH equals 7).