Calculator Inputs
Example Data Table
| Input Mode | Input | pKw | Output pOH | Output pH | Status |
|---|---|---|---|---|---|
| Known pH | pH = 9.50 | 14.00 | 4.50 | 9.50 | Basic |
| Known pOH | pOH = 3.20 | 14.00 | 3.20 | 10.80 | Basic |
| Known [OH-] | [OH-] = 1.0e-5 mol/L | 14.00 | 5.00 | 9.00 | Basic |
| Known [H+] | [H+] = 3.2e-4 mol/L | 14.00 | 10.51 | 3.49 | Acidic |
| Check | pH = 7.00, pOH = 7.00 | 14.00 | 7.00 | 7.00 | Neutral |
Formula Used
- pOH definition:
pOH = −log10([OH−]), where[OH−]is in mol/L. - pH definition:
pH = −log10([H+]), where[H+]is in mol/L. - Water relation:
pH + pOH = pKw, withpKw ≈ 14near room temperature. - Conversions:
[OH−] = 10^(−pOH)and[H+] = 10^(−pH).
Note: This tool uses common textbook relations and treats inputs as concentrations for practical lab estimation.
How to Use This Calculator
- Select your Input mode (pH, pOH, [OH−], [H+], or a consistency check).
- Enter pKw if you need a non-default condition.
- Provide the required value using normal or scientific notation.
- Click Calculate. Results appear above the form.
- Use Download CSV or Download PDF to export the results.