How to use the titration calculator
Find unknown concentration from a titration volume. Enter titrant concentration, titrant volume at endpoint, sample volume, mole ratio titrant : sample in the fields above; the moles titrant, sample concentration are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- Ca — Titrant concentration (mol/L)
- Va — Titrant volume at endpoint (mL)
- Vb — Sample volume (mL)
- r — Mole ratio titrant : sample
Worked example
With titrant concentration = 0.1 mol/L, titrant volume at endpoint = 22.5 mL, sample volume = 25 mL, mole ratio titrant : sample = 1, the calculator gives moles titrant ≈ 2.25 mmol; sample concentration ≈ 0.09 mol/L.
Frequently asked questions
What is the formula for the titration calculation?
Moles titrant (mmol) = Ca × Va. Sample concentration (mol/L) = [Moles titrant] / r / Vb. Here Ca is titrant concentration (mol/L), Va is titrant volume at endpoint (mL), Vb is sample volume (mL), r is mole ratio titrant : sample.
What inputs do I need for the titration calculator?
You need titrant concentration in mol/L, titrant volume at endpoint in mL, sample volume in mL, mole ratio titrant : sample. 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.