pOH Calculator
Calculate the pOH and pH of a solution from the hydroxide ion concentration [OH-].
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Calculation Parameters
Adjust the values below.
1.09.9
-140
Calculated Result
Calculated pOH 7.00
Resulting pH 7.00
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Expert Tip
Ensure units are correctly formatted (e.g. Kelvin for gas temperatures and liters for volumes) to get chemically accurate outputs.
How this Calculator Works
This calculator allows you to solve pOH problems dynamically. Adjust the input parameters using the sliders or selection menu below:
- OH- Concentration - Coefficient (Range: 1.0 to 9.9, Default: 1.0)
- OH- Concentration - Exponent (10^x) (Range: -14 to 0, Default: -7)
The results are computed instantly and updated in the results panel on the right.
Formula & Methodology
pOH = -log10([OH-])
pH = 14 - pOH
pH = 14 - pOH
Where:
- OH- Concentration - Coefficient: Parameter value.
- OH- Concentration - Exponent: Parameter value.
Step-by-Step Calculation Example
To calculate pOH manually, follow these steps:
- Identify the input parameters. For example:
- OH- Concentration - Coefficient = 1.0
- OH- Concentration - Exponent (10^x) = -7
- Apply the formula:
pOH = -log10([OH-])
pH = 14 - pOH - Verify the calculated value which is updated instantly in the results panel on the right.
Frequently Asked Questions
What is pOH? ▼
pOH is the negative logarithm of hydroxide ion concentration: pOH = -log10([OH-]).
How do you calculate pH from pOH at 25°C? ▼
pH = 14.0 - pOH.
What does a low pOH value indicate? ▼
A low pOH value (< 7.0) indicates a high concentration of OH- ions, signifying a strongly basic/alkaline solution.