The pH of a solution is the concentration of hydrogen ion concentration in the solution. Mathematically, it is expressed as pH = -log(H+), where H+ is the concentration of hydrogen ion
So, for the slightly acidic solution with pH 5.0
5.0 = -log(H+)
(H+) = Antilog (-5.0)
(H+) = 0.00001M
Place (H+) in standard form
(H+) = 1.0 x 10^-5M
Thus, the concentration of hydrogen ion in the solution with pH 5.0 is 1.0 x 10^-5M
