What is the equivalence point?

The equivalence point (also called the stoichiometric point) is the exact moment during a titration when the moles of titrant added equal the moles of analyte present, according to the reaction stoichiometry. All of the analyte has been neutralized.

How is the equivalence volume calculated?

Using the relation n₁C₁V₁ = n₂C₂V₂, where n is the stoichiometric coefficient, C is molar concentration, and V is volume. Solving for V₂ gives: V_titrant = (n₂ × C_analyte × V_analyte) / (n₁ × C_titrant).

What stoichiometric ratio should I use?

For most strong acid / strong base titrations (e.g. HCl + NaOH) use 1:1. For diprotic acids like H₂SO₄ reacting with NaOH, use 1:2. For triprotic acids like H₃PO₄ fully neutralized by NaOH, use 1:3.

Is the equivalence point the same as the endpoint?

No. The endpoint is when the indicator changes color, which ideally coincides with the equivalence point but may differ slightly due to indicator choice. This calculator computes the theoretical equivalence point.

What units does this calculator use?

Volume is in milliliters (mL) and concentration is in moles per liter (mol/L or M). Moles output is in millimoles (mmol) for convenience.

Equivalence Point Calculator

Name: Equivalence Point Calculator
Availability: InStock
Author: Nham Vu

Enter analyte and titrant data to instantly calculate the equivalence point volume and moles for any acid-base titration.

Titration Parameters

Analyte (Solution Being Titrated)

Volume (mL)

Concentration (mol/L)

Titrant (Solution Added from Burette)

Concentration (mol/L)

Stoichiometric ratio (analyte : titrant)

Equivalence Point Results

Enter values and click Calculate to see the equivalence point.

Common Titration Pairs

Acid	Base	Ratio	Eq. pH
HCl	NaOH	1 : 1	7.0
H₂SO₄	NaOH	1 : 2	7.0
CH₃COOH	NaOH	1 : 1	~8.7
H₃PO₄	NaOH	1 : 3	~9.7
HNO₃	KOH	1 : 1	7.0

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Summary

Enter analyte and titrant data to instantly calculate the equivalence point volume and moles for any acid-base titration.

How it works

Enter the volume of the analyte solution (the solution being titrated) in mL.
Enter the molar concentration of the analyte (e.g. 0.1 M HCl).
Enter the molar concentration of the titrant (e.g. 0.1 M NaOH).
Select the stoichiometric ratio between analyte and titrant (usually 1:1 for strong acid/base).
The calculator applies n₁C₁V₁ = n₂C₂V₂ to find the equivalence volume and total moles.

Use cases

Determine how much NaOH to add to completely neutralize an HCl solution.
Plan titration experiments in undergraduate chemistry labs.
Verify equivalence point calculations before running a physical titration.
Calculate moles of analyte consumed at the equivalence point.
Scale up or scale down titration volumes for different flask sizes.
Compare strong acid/strong base, weak acid/strong base, and diprotic acid scenarios.

Frequently Asked Questions

Last updated: 2026-06-18 · Reviewed by Nham Vu