Taking into account the definition of net ionic equation, a precipitate of BaSO₄ is formed.
The net ionic equation is a chemical equation for a reaction that lists only the species that participate in the reaction.
In other words, an ionic equation is a chemical equation where electrolytes in aqueous solution are written as dissociated ions. Usually this is a salt dissolved in water.
A spectator ion is an ion that appears both as a reactant and as a product in an ionic equation.
When writing a net ionic equation, spectator ions found in the original equation are ignored. Thus, the total ionic reaction is different from the net chemical reaction.
The balanced equation will be:
Cu₂SO₄ (aq) + BaCl₂ (aq) → 2 CuCl (aq) + BaSO₄ (s)
where (aq) means aqueous and (s) solid.
Taking into account that:
The total ionic equation in separated aqueous solution will be:
2 Cu⁺ (aq) + SO₄²⁻ (aq) + Ba²⁺(aq) + 2 Cl⁻ (aq) → 2 Cu⁺ (aq) + 2 Cl⁻ (aq) + BaSO₄ (s)
Cu⁺ and Cl⁻ are the spectator ions because they appear unchanged in both the product and the reagent. So these ions cancel out. And you get the net ionic equation as follow:
SO₄²⁻ (aq) + Ba²⁺(aq) → BaSO₄ (s)
Finally, a precipitate of BaSO₄ is formed because is an insoluble salt and it will precipitate.
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