The equation pH + pOH = 14 defines the relationship between the acidity and basicity of a solution at 25°C, indicating that the sum of the pH and pOH values is always equal to 14. This concept is essential in understanding how the concentration of hydrogen ions (H extsuperscript{+}) and hydroxide ions (OH extsuperscript{-}) interact in aqueous solutions. It serves as a foundation for calculating the pH or pOH when one of these values is known, which is crucial for evaluating strong and weak acids and bases.
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