How to use the mixing acid and base calculator
Find the resulting pH after mixing strong acid with strong base. Enter acid concentration, acid volume, base concentration, base volume in the fields above; the excess concentration, final 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 (mL)
Worked example
With acid concentration = 0.1 mol/L, acid volume = 50 mL, base concentration = 0.15 mol/L, base volume = 40 mL, the calculator gives excess concentration ≈ 0.01111111 mol/L; final ph ≈ 12.04576.
Frequently asked questions
What is the formula for the mixing acid and base calculation?
Excess concentration (mol/L) = abs(Ca × Va-Cb × Vb) / (Va+Vb). Final pH = Ca × Va>Cb × Vb?-log10([Excess concentration]):(Ca × Va<Cb × Vb?14+log10([Excess concentration]):7). Here Ca is acid concentration (mol/L), Va is acid volume (mL), Cb is base concentration (mol/L), Vb is base volume (mL).
What inputs do I need for the mixing acid and base calculator?
You need acid concentration in mol/L, acid volume in mL, base concentration in mol/L, base volume 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.