Ammonium hydroxide, NH₄OH, is a weak base and actually doesn't exist as a distinct molecule. It's a solution of ammonia (NH₃) in water (H₂O).

Here's what happens when ammonia dissolves in water:

* Ammonia (NH₃) acts as a base and accepts a proton (H⁺) from water.

* This forms the ammonium ion (NH₄⁺) and the hydroxide ion (OH⁻).

So, the ions present in an ammonium hydroxide solution are:

* Ammonium ion (NH₄⁺)

* Hydroxide ion (OH⁻)

While we often refer to the solution as ammonium hydroxide, it's more accurate to say it's an aqueous ammonia solution.