Reviewed By: Patrick Myers (BSME)
Enter the total pH value into the pOH Calculator. The calculator will evaluate the pOH. This calculator can also determine the pH given the pOH.
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pOH Formula
The following two example problems outline the steps and information needed to calculate the pOH.
pOH = 14 - pH
pH = 14 - pOH
- pOH is the pOH
- pH is the total pH value
To calculate pOH, simply subtract the pH value from 14.
| pH | pOH |
|---|---|
| 0.00 | 14.00 |
| 1.00 | 13.00 |
| 2.00 | 12.00 |
| 3.00 | 11.00 |
| 4.00 | 10.00 |
| 5.00 | 9.00 |
| 5.50 | 8.50 |
| 6.00 | 8.00 |
| 6.50 | 7.50 |
| 7.00 | 7.00 |
| 7.20 | 6.80 |
| 7.40 | 6.60 |
| 8.00 | 6.00 |
| 8.50 | 5.50 |
| 9.00 | 5.00 |
| 10.00 | 4.00 |
| 11.00 | 3.00 |
| 12.00 | 2.00 |
| 13.00 | 1.00 |
| 14.00 | 0.00 |
| At 25°C, pKw ≈ 14.00, so pH + pOH = 14.00. Values rounded to 2 decimals. | |
How to Calculate pOH?
The following steps outline how to calculate the pOH.
- First, determine the total pH value.
- Next, gather the formula from above = pOH = 14 - pH.
- Finally, calculate the pOH.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
the total pH value = 8
pOH = 14 - pH = ?