Definition of pH:
pH is defined as the negative log of the hydrogen ion concentration, or pH = -log [H+]. pH may be an abbreviation of power of hydrogen or more explicitly the power of hydrogen ion concentration The pH scale commonly ranges from 0 to 14, which denotes a measure of the alkalinity or acidity of a solution. The pH scale is equal to 7 numerically for the neutral value of pH. An increase in the numerical value above 7 denotes an increase in alkalinity, while a decrease in the value below 7 shows an increase in the acidity of the solution.
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