Question #b2dc8

Mar 15, 2016

$\text{OH}$ is not a polyatomic ion because it is not an ion.

Explanation:

However, $\boldsymbol{\text{OH"^"-}}$ (note the negative charge) is a polyatomic ion.

A polyatomic ion is an ion composed of two or more covalently bonded atoms.

The prefix poly- means "many" in Greek, but even ions of two atoms are commonly called polyatomic ions.

In your equation, $\text{KOH}$ is an ionic compound consisting of ${\text{K}}^{+}$ ions and $\text{OH"^"-}$ ions, and the $\text{OH"^"-}$ ions are polyatomic.