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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 value is a measure of the acidity or alkalinity of a solution, the scale goes from 0 to 14. Values below 7 are considered acidic, while those with a value greater than 7 are considered basic. A pH level of exactly 7.0 is defined as being neutral. Source(s): http://en.wikipedia.org/wiki/PH. Vinni Â· 8 years ago.