The pH (Hydrogen potential) varies in function with the quantity of hydrogen ions or H+ contained in a solution and measures the acidity or the alkalinity. The neutrality of pH is established at 7.40 in human cells because that is the pH of the blood (otherwise, neutral is established at 7 on a scale from 0 to 14). All solutions with an inferior pH value are considered acids and all those with a superior value are called alkalines, or bases, which means the same. An alkaline substance then is a substance that will raise the pH of the blood.
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. Translated by Jeff