Good post friend , The pH scale ranges from the highest acidic( 0) to the most alkaline(14). The pH of 7 is neutral.At pH 7, water contains equal amounts of H+ and OH- ions. Substances with a pH of less than 7 are acidic because they contain a higher concentration of H+ ions. Substances with a pH higher than 7 are alkaline because they contain a higher concentration of OH-. thanks !!