PH scale is used to determine how acidic or basic a solution is. pH can be calculated as follows; by knowing the ph we can calculate pOH pH + pOH = 14 pOH = 14 - 8.1 pOH = 5.9 pOH is used to calculate the hydroxide ion concentration pOH = -log[OH⁻] [OH⁻] = antilog(-pOH) [OH⁻] = 1.26 x 10⁻⁶ M therefore hydroxide ion concentration is 1.26 x 10⁻⁶ M
