Buffer pH Calculator
Calculate buffer pH with Henderson-Hasselbalch.
About Buffer pH Calculator
Converting pH for Buffer pH uses the definition pH = -log10[H+], so the hydrogen-ion concentration is ten to the power of negative pH, and pOH mirrors it on the hydroxide side. Each pH unit is a tenfold concentration change, which is why pH compresses an enormous range into 0 to 14.
Formula
Buffer pH
[H+] = 10^(-pH); pOH = 14 - pH
- pOH
- Hydroxide-side counterpart, with pH + pOH = 14 at 25 C
Worked example
With the default values below, Buffer pH Calculator returns H+ Concentration of 0.00000010. Change any input above and every figure here is recalculated in your browser.
Inputs used
- pHaccepts 0–14
- 7
- Acid concentrationminimum 0 M
- 0.1 M
- Temperatureminimum 0 C
- 25 C
Results
- H+ Concentration
- 0.00000010 M
- pOH
- 7.000
- OH- Concentration
- 0.00000010 M
Step by step
- 1Values used
- 2Buffer pH
- 3H+ Concentration= 0.00000010 M
- 4pOH= 7.000
- 5OH- Concentration= 0.00000010 M
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 8 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Buffer pH calculated?
[H+] = 10^(-pH); pOH = 14 - pH Converting pH for Buffer pH uses the definition pH = -log10[H+], so the hydrogen-ion concentration is ten to the power of negative pH, and pOH mirrors it on the hydroxide side.
Why does Buffer pH matter?
Each pH unit is a tenfold concentration change, which is why pH compresses an enormous range into 0 to 14.
What values do I need to enter?
This calculator takes 3 inputs: pH, Acid concentration, Temperature. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.