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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+)
Alkalinity is expressed as a pH number, on a scale of 0 to 14. A pH of 7 is neutral; neither acidic nor alkaline. A substance measuring a pH level between 7 and 14 is alkaline, and is called basic (or a base). The closer a substance is to pH 14, the more alkaline it is. Foods are substantially made of water, so they also have a pH that can be measured.