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At \(25°C\), the \(pH\) and \(pOH\) of a water solution are related by the following equation:
 
It is possible to calculate the other value if the \(pH\) or \(pOH\) of a solution is known.
 
Example:

\(pOH\) of a solution is \(11.76\). What is the \(pH\) of this solution?
 
\(pH\)indicates or  concentration, whereas \(pOH\) indicates  or  concentration.