Ph
A measure of the acidity or alkalinity of a solution based on its hydrogen ion (H+) concentration. The pH of a solution is the negative logarithm (base 10) of its H+ concentration. Since the scale is logarithmic, there is a tenfold difference in hydrogen ion concentration for each pH unit. The pH scale ranges from 0 to 14 with 7 indicating neutrality ((H+)= (OH-)). Values above 7 indicate progressively greater alkalinity, while values below 7 indicate progressively increasing acidity.
pH scale. (McGraw-Hill Inc. Reproduced by permission.)Acid and Base; Buffer
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