On the pH scale, we can measure pH from 0 (very acidic) to ______ (very alkaline).
14
The correct answer is 14.
For example, a solution with a pH of 3 is ten times more acidic than a solution with a pH of 4, and a hundred times more acidic than a solution with a pH of 5. Another related scale is the pOH scale, which measures the concentration of hydroxide ions ($$\text{OH}^-$$). The relationship between pH and pOH in aqueous solutions at 25°C is given by: $$ \text{pH} + \text{pOH} = 14 $$ Understanding both pH and pOH helps in fully characterizing the acidity or alkalinity of a solution.
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