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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+)
pH is a measure of acidity or alkalinity of a solution. The level of acidity or alkalinity of a solution is expressed as a number from 1 to 14 on the pH scale. The lower the pH number, the more acidic the solution is. The higher a pH number, the more alkaline (or basic) the solution is. A pH measurement of 1 would be the most acidic, 7 neutral, and 14 the most alkaline. The pH scale is logarithmic rather than arithmetic or linear. This means that moving one unit either way on the pH scale results in a 10-fold increase in the degree of alkalinity or acidity.