When barium bromide (BaBr₂) is put into water, it dissolves and dissociates into its ions. The reaction is as follows:

BaBr₂(s) → Ba²⁺(aq) + 2Br⁻(aq)

Here's what the equation represents:

* BaBr₂(s): Solid barium bromide.

* Ba²⁺(aq): Barium ions in aqueous solution (dissolved in water).

* 2Br⁻(aq): Bromide ions in aqueous solution (dissolved in water).

Key points:

* This is a dissolution reaction, where a solid compound dissolves in a solvent (water).

* Barium bromide is a strong electrolyte, meaning it completely dissociates into ions when dissolved in water.

* The reaction is reversible, but the equilibrium lies heavily towards the right, indicating that most of the barium bromide will dissociate into ions.

Note: Barium compounds are toxic and should be handled with care.