Question

How are pH and pOH related?

Answer 1

Hint: The pH of the solution is used to know the concentration of hydrogen ion present in the solution whereas the pOH of the solution is used to know the concentration of hydroxide ion present in the solution. Both show relation with each other.

Complete answer:
The acids are defined as those species which donate their proton or hydrogen ion when dissolved in water. The pH of the acid is below 7.
The bases are defined as those species which accept the proton of hydrogen ions donated by the acid. The pH of the base is higher than 7.
The acidic strength of the acid is calculated by the pH and the basic strength of base is calculated by the pOH.
The pH of an acid is defined as the negative logarithm of hydrogen ion concentration.
The equation used to calculate the pH is shown below.
$pH = - \log [{H^ + }]$
The pOH of the base is defined as the negative logarithm of hydroxide ion concentration.
The equation used to calculate the pOH is shown below.
$pOH = - \log [O{H^ - }]$
The pH of the acid and the pOH of the bases are related with each other by the following equation as shown below.
$pH + pOH = 14$
This relation can also be written as shown below.
$pH + pOH = {k_w}$
Where ${k_w}$ is the constant used for water.
For water, the pH and pOH value is equal to 7.

Note:
The pH and pOH scale is the same where the neutral solution has the pH of 7. The pOH value less than 7 indicates the solution is basic in nature and the pOH value more than 7 indicates the solution is acidic in nature.