How to use the strong acid–strong base titration ph calculator
Compute the pH at any point of a strong acid titration with strong base. Enter acid concentration, acid volume, base concentration, base volume added in the fields above; the excess h⁺ (negative = excess oh⁻), ph are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- Ca — Acid concentration (mol/L)
- Va — Acid volume (mL)
- Cb — Base concentration (mol/L)
- Vb — Base volume added (mL)
Worked example
With acid concentration = 0.1 mol/L, acid volume = 25 mL, base concentration = 0.1 mol/L, base volume added = 20 mL, the calculator gives excess h⁺ (negative = excess oh⁻) ≈ 0.01111111 mol/L; ph ≈ 1.954243.
Frequently asked questions
What is the formula for the strong acid–strong base titration ph calculation?
Excess H⁺ (negative = excess OH⁻) (mol/L) = (Ca × Va-Cb × Vb) / (Va+Vb). pH = [Excess H⁺ (negative = excess OH⁻)]>1e-9?-log10([Excess H⁺ (negative = excess OH⁻)]):([Excess H⁺ (negative = excess OH⁻)]<-1e-9?14+log10(-[Excess H⁺ (negative = excess OH⁻)]):7). Here Ca is acid concentration (mol/L), Va is acid volume (mL), Cb is base concentration (mol/L), Vb is base volume added (mL).
What inputs do I need for the strong acid–strong base titration ph calculator?
You need acid concentration in mol/L, acid volume in mL, base concentration in mol/L, base volume added in mL. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.