Acid Base Titration Calculator
Calculate the titrant volume needed to reach equivalence and the concentration it reveals.
About Acid Base Titration Calculator
Titration matches equivalents rather than moles, so a diprotic acid needs twice the titrant volume of a monoprotic one at the same molarity. The half-equivalence volume is where pH equals pK_a. Titration is the standard method for determining an unknown concentration precisely, and the equivalence volume is what the whole measurement turns on.
Formula
Acid Base Titration
Equivalents of acid = equivalents of base at the equivalence point
- equivalence point
- Where moles of titrant exactly neutralise the analyte
- equivalents
- Moles multiplied by protons or hydroxides supplied
Worked example
With the default values below, Acid Base Titration Calculator returns Titrant Volume at Equivalence of 25.0000. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Volume of analyteminimum 0 mL
- 25 mL
- Analyte concentrationminimum 0 mol/L
- 0.1 mol/L
- Titrant concentrationminimum 0 mol/L
- 0.1 mol/L
- Protons per analyte moleculeaccepts 1–6
- 1
- Hydroxides per titrant moleculeaccepts 1–6
- 1
Results
- Titrant Volume at Equivalence
- 25.0000 mL
- Moles of Analyte
- 0.002500 mol
- Equivalents of Analyte
- 0.002500 eq
- Volume at Half Equivalence
- 12.5000 mL
- Total Volume at Equivalence
- 50.000 mL
Step by step
- 1Values used
- 2Acid Base Titration
- 3Titrant Volume at Equivalence= 25.0000 mL
- 4Moles of Analyte= 0.002500 mol
- 5Equivalents of Analyte= 0.002500 eq
- 6Volume at Half Equivalence= 12.5000 mL
- 7Total Volume at Equivalence= 50.000 mL
Assumptions and limits
- The result is derived only from the 5 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 6 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 Acid Base Titration calculated?
Equivalents of acid = equivalents of base at the equivalence point Titration matches equivalents rather than moles, so a diprotic acid needs twice the titrant volume of a monoprotic one at the same molarity. The half-equivalence volume is where pH equals pK_a.
Why does Acid Base Titration matter?
Titration is the standard method for determining an unknown concentration precisely, and the equivalence volume is what the whole measurement turns on.
What values do I need to enter?
This calculator takes 5 inputs: Volume of analyte, Analyte concentration, Titrant concentration, Protons per analyte molecule, Hydroxides per titrant molecule. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.