The balanced ionic equation where a precipitate of barium sulfate is formed when aqueous solutions of barium nitrate and potassium sulfate are mixed is given below:
Ba(NO₃)₂ (aq) + K₂SO₄ (aq)→ BaSO₄ (s) + 2KNO₃ (aq)
In this reaction, mutual exchange of cations and anions take place on both reactant and product side. So, this reaction is an example of a double displacement reaction.
The overall ionic equation is written as:
2K⁺ (aq)+SO₄²⁻(aq)+ Ba²⁺(aq) + 2NO₃⁻(aq) → BaSO₄(s) + 2K⁺(aq) +2NO₃⁻(aq)
The net ionic equation obtained after eliminating same ions on both sides of the reaction:
SO₄²⁻ + Ba²⁺ → BaSO₄
barium sulfate
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