Taking into account the definition of pH and pOH, the solution has a pOH of 6.92 and a pH of 7.08.
pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:
pH= - log [H⁺]= - log [H₃O⁺]
Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
The following relationship can be established between pH and pOH:
pOH + pH= 14
A solution has an [OH⁻] concentration of 1.20×10⁻⁷ M. Replacing in the definition of pOH:
pOH= - log (1.20×10⁻⁷ M)
Solving
pOH= 6.92
Then, pH is calculated as:
pH + 6.92= 14
pH= 14 - 6.92
pH= 7.08
Finally, the solution has a pOH of 6.92 and a pH of 7.08.
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