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A 1 to 14 scale that measures alkalinity or acidity: pH7 is neutral, below 7 is acid and above 7 is alkaline.
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|Noun||1.||pH scale - (from potential of Hydrogen) the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and greater than 7 is more basic and less than 7 is more acidic);|
hydrogen ion concentration - the number of moles of hydrogen ions per cubic decimeter
acidity - pH values below 7
alkalinity - pH values above 7
neutrality - pH value of 7