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When pH is 1, 2 3 4 5 or 6, it is considered an Acid. When pH is 8 9 10 11 12 13 or 14, it is considered a Base. 7 is the neutral point of acid and base. pH is calculated by the -log (H+)
1 If a base is added to an acidic solution, the solution becomes less acidic and moves toward the middle of the pH scale. 2  This is called neutralizing the acid. 3  If an acid is added to a basic solution, the solution becomes less basic and moves toward the middle of the pH scale. 4  This is called neutralizing the base. pH is a measure of the concentration of H 3 O + ions in a solution. 2  Adding an acid increases the concentration of H 3 O + ions in the solution. 3  Adding a base decreases the concentration of H 3 O + ions in the solution.