Respuesta :
Taking into account the definition of net ionic equation, a precipitate of BaSO₄ is formed.
Net ionic equation
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.
Spectator ion
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.
Reaction in this case
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:
- All Cl⁻, Br⁻ and I⁻ salts are soluble.
- Most of the sulphates are soluble, with the exception of the sulphates of Ba²⁺, Pb²⁺, Ag⁺ and Sr²⁺.
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.
Learn more about net ionic equation:
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