Titration Calculator
Equivalence by equivalents, not by moles.
Work out Titration. Equivalence by equivalents, not by moles. Shows the working, not just the answer.
Protons donated: 1 for HCl, 2 for H₂SO₄.
Titrant at equivalence (mL)
25
2.5 mmol of analyte
The equivalence point is where the equivalents match, not where the moles do — a diprotic acid needs twice the base per mole. Note also that the equivalence point and the endpoint are different things: the first is stoichiometric, the second is where the indicator changes, and the gap between them is the indicator error. For a strong acid with a strong base the equivalence pH is 7, but titrating a weak acid puts it above 7, which is why phenolphthalein rather than methyl orange is correct there.
How the Titration Calculator works
The equivalence point is where the equivalents match, not where the moles do — a diprotic acid needs twice the base per mole. The equivalence point and the endpoint are also different things, and the gap between them is the indicator error.
Also known as: equivalence point calculator · titration volume calculator · acid base titration calculator · how to calculate titration volume
Frequently asked questions
How do I calculate titrant volume?
Multiply the analyte's concentration, volume and equivalents, then divide by the titrant's concentration and equivalents. 25 mL of 0.1 M HCl needs 25 mL of 0.1 M NaOH.
What is the difference between the equivalence point and the endpoint?
The equivalence point is stoichiometric; the endpoint is where the indicator changes colour. The difference is indicator error, and choosing the right indicator minimises it.
Why is the equivalence pH not always 7?
Only for a strong acid with a strong base. Titrating a weak acid leaves its conjugate base in solution, pushing the equivalence pH above 7 — which is why phenolphthalein rather than methyl orange is correct there.
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