Every unit change in pH actually represents a 10-fold change in [H+] because of the logarithmic relationship.

Question

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This is a well-known fact in chemistry that a change of one unit in pH represents a tenfold change in hydrogen ion concentration (or acidity/alkalinity). This is because pH is defined as the negative logarithm of the concentration of hydrogen ions in a solution. For example, a solution with pH 3 has 10 times more hydrogen ions than a solution with pH 4, and 100 times more hydrogen ions than a solution with pH 5.

Every Unit Change in PH Actually Represents a 10-Fold Change