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The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic. The pH scale is logarithmic and as a result, each whole pH value below 7 is ten times more acidic than the next higher value. For example, pH 4 is ten times more acidic than pH 5 and 100 times (10 times 10) more acidic than pH 6.
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.