pH Calculator
Calculate pH, pOH, hydrogen ion concentration, and hydroxide concentration. Determine if a solution is acidic, neutral, or basic.
Inputs
Results
pH
3
How to Use This Calculator
- Select the calculation mode: pH from [H+] concentration, pOH from [OH-], or solve from pH.
- Enter the known concentration (mol/L) or the known pH/pOH value.
- Review pH, pOH, hydrogen ion concentration, and hydroxide ion concentration.
- pH + pOH = 14 at 25C -- use this to quickly find the conjugate value.
- Use for acid-base chemistry, buffer preparation, and water quality assessment.
How the result changes with Concentration (mol/L)
| Concentration (mol/L) | pH |
|---|---|
| 1 | -0 |
| 3.5 | -0.5441 |
| 6.5 | -0.8129 |
| 9 | -0.9542 |
What each input means
- Solve For
- The variable to solve for.
- Concentration (mol/L)
- Molar concentration of H⁺ or OH⁻ ions.
- pH Value
- Used when solving for H⁺ from pH.
How this is calculated
Worked example, using the default values
- Identify Input ParametersSolve For = 0, Concentration (mol/L) = 0.001, pH Value = 7 = 3 input(s) provided
- Calculate pHpH3 = 3
- Calculate pOHpOH11 = 11
- Calculate [H⁺][H⁺] = hConc0.001 = 0.001
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