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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+)
The pH scale measures, on a scale from 0 to 14, the acidic or basic qualities of a chemical. The pH of battery acid is 0, while the pH of lye, a basic, or alkaline, cleaning substance, is close to 14. Water, with a pH of 7, is neutral, being neither acidic or basic. The normal pH range for saliva is considered to be 5.6 to 7.9, according to the International Journal of Drug Testing.