Explain why a pH of 7 indicators a neutral solution- why not some other number? Explain why a pH of 7 indicators a neutral solution- why not some other number? Solution The pH scale is 0-14 So, half of it is pH 7 below pH 7 is acidic and above pH 7 is basic Thus as we increase pH from 0 to 14, we come across middle of pH scale that is pH 7, where, amount of H+ and OH- in solution are equal to each other, making the solution neutral. Below pH 7, amount of H+ is greater than OH- and above pH 7, amount of OH- is greater than H+ in solution. .