Question

what is the formula for the hydroxide ion?
ho+
h2o
h2-
oh-

Explanation:

The hydroxide ion consists of one oxygen atom and one hydrogen atom with a negative charge. $HO^{+}$ is a positively - charged ion (not hydroxide). $H_{2}O$ is water (a neutral molecule). $H_{2}^{-}$ is an ion with two hydrogen atoms (not hydroxide). $OH^{-}$ is the correct formula for the hydroxide ion as it has one oxygen, one hydrogen, and a negative charge.

Answer:

$OH^{-}$