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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 level of a solution is nothing more than the concentration of positively charged ions in that substance. These positively charged particles are expressed on a pH scale, which ranges from 0 (acid) to 14 (alkaline). A liquid with a pH level of 7 is called neutral; non acidic and non alkaline.