An acidic substance is a substance that has a high concentration of free protons, or positive hydrogen ions. This is reflected in the pH scale, which is a measure of the concentration of positive Hydrogen ions.
A*cid"ic (#), a. Min.
Containing a high percentage of silica; -- opposed to basic.
<-- 2. of or relating to acid; having the character of an acid, as an acidic solution. -->
© Webster 1913.
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