Here's why:

* Strong electrolytes dissociate completely into ions when dissolved in water. This means that when you dissolve BaCl₂ in water, it breaks down into barium ions (Ba²⁺) and chloride ions (Cl⁻).

* Ionic compounds like barium chloride generally form strong electrolytes because the electrostatic attraction between the ions is strong enough to cause complete dissociation in solution.

Let me know if you have any other questions!