The
pH scale is the measurement of the hydrogen ion (H+) concentration in an aqueous solution.
It is used to measure the acidity or alkalinity of a solution. The pH scale
ranges from 0 to 14. A neutral solution has a pH of 7; a solution with a pH
greater than 7 is basic (or alkaline); and a solution with a pH less than 7 is
acidic. The lower the pH is, the more acidic the solution is. As the pH scale
is logarithmic, each whole number drop on the scale represents a tenfold
increase in acidity (the concentration of H+
increases tenfold).
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