---
title: "Spectator Ions — AP Chem Definition & Exam Guide"
description: "Spectator ions appear unchanged on both sides of an ionic equation, so you cancel them to write net ionic equations, a core AP Chem Unit 4 skill."
canonical: "https://fiveable.me/ap-chem/key-terms/spectator-ions"
type: "key-term"
subject: "AP Chemistry"
---

# Spectator Ions — AP Chem Definition & Exam Guide

## Definition

Spectator ions are ions that exist in the same form on both sides of a chemical equation. They do not participate directly in the reaction.

## Related Study Guides

- [4.7 Types of Chemical Reactions](/ap-chem/unit-4/types-chemical-reactions/study-guide/0VTaPH2MhqYc3Azc3xJz)
- [4.2 Net Ionic Equations](/ap-chem/unit-4/net-ionic-equations/study-guide/VTCEO9cDrSHfPodoWGxS)
- [4.8 Introduction to Acid-Base Reactions](/ap-chem/unit-4/intro-acid-base-reactions/study-guide/idvZ7Ve4pFo8gFIyYfMl)

## Review

### Related Terms

- [Cation](/ap-chem/key-terms/cation): A positively charged ion; it's like an overly enthusiastic fan who radiates positive energy at concerts.
- [Anion](/ap-chem/key-terms/anion): A negatively charged ion; akin to someone at the concert who's not enjoying it and radiating negative vibes.
- [Salt](/ap-chem/key-terms/salt): A compound resulting from the reaction of an acid with a base. It's like the harmony created when different band members (acid and base) come together to create music.