Agraphical representation of the strength of an acid or base

The correct answer to this open question is the following.

A graphical representation of the strength of an acid or base is the "pH scale."

The pH scale is used to represent the acidic grade of a solution. The ph scale helps us to identify the concentration of hydrogen ions in any solution. The first studies on the subject were developed by Danish scientist Soren Lauritz Sorensen in 1909.

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answer; i believe the correct answer is (clockwise and outward) about the center;