---
title: "Half-Equivalence Point — AP Chem Definition & Exam Guide"
description: "The half-equivalence point is where half the weak acid is neutralized, so [HA] = [A⁻] and pH = pKa. It's how AP Chem ties titrations to Henderson-Hasselbalch."
canonical: "https://fiveable.me/ap-chem/key-terms/half-equivalence-point"
type: "key-term"
subject: "AP Chemistry"
---

# Half-Equivalence Point — AP Chem Definition & Exam Guide

## Definition

The half-equivalence point in a titration occurs when the amount of titrant added is exactly half what is needed to reach the equivalence point.

## Related Study Guides

- [8.7 pH and pKa](/ap-chem/unit-8/ph-pka/study-guide/yKYJCv37E6gkI01yeRwG)

## Review

### Related Terms

- [Titration](/ap-chem/key-terms/titration): A technique where a solution of known concentration is used to determine the concentration of an unknown solution.
- [Equivalence Point](/ap-chem/key-terms/equivalence-point): This is the point in a titration at which enough titrant has been added to react exactly with the substance in solution being titrated.
- [Indicator](/ap-chem/key-terms/indicator): A substance that changes color in response to a chemical change. An acid–base indicator changes color depending on pH.