---
title: "Equimolar — AP Chemistry Definition & Exam Guide"
description: "Equimolar means equal moles of two or more substances. In AP Chem it defines ideal buffers (pH = pKa), the half-equivalence point, and gas mixture setups on FRQs."
canonical: "https://fiveable.me/ap-chem/key-terms/equimolar"
type: "key-term"
subject: "AP Chemistry"
---

# Equimolar — AP Chemistry Definition & Exam Guide

## Definition

Equimolar refers to having equal molar quantities of different substances present in a solution or mixture. This means that there are an equal number of moles of each substance.

## Review

### Related Terms

- [HCl](/ap-chem/key-terms/hcl): Hydrochloric acid, a strong acid that dissociates in water to produce hydrogen ions (H+) and chloride ions (Cl-).
- [NaF](/ap-chem/key-terms/naf): Sodium fluoride, an ionic compound made up of sodium ions (Na+) and fluoride ions (F-) that easily dissolves in water.
- [Solution](/ap-chem/key-terms/solution): A homogeneous mixture where one substance called the solute dissolved completely into another substance called the solvent.