Question

Sodium sulfate, Na2SO4, and barium chloride, BaCl2, are soluble compounds that form clear solutions. However, when aqueous solutions of sodium sulfate and barium chloride are mixed together, a white solid (a precipitate) forms

Part 1: Using the molecular representations in the image, which of the two solutions is being poured out of the graduated cylinder, sodium sulfate or barium chloride?

Part 2: Which cation and which anion combine to form the precipitate?

Choose one:

Barium, Ba2+, and sulfate, SO42–

Barium, Ba2+, and chloride, Cl–

Sodium, Na+, and sulfate, SO42–

Sodium, Na+, and chloride, Cl–

Part 3:Write a balanced chemical equation that only includes the particles that change their physical states during the precipitation reaction (this is known as a net ionic equation). Be sure to include state labels (s, l, g, aq) for all reactants and products in your equation.

Answer 1

Sol:-
Chemical equation of given precipitization reaction is :

Na₂SO₄(aq) + BaCl₂(aq) ---------------> BaSO₄(s) + 2 NaCl(aq)

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Part 2:-

Ba²⁺ cation and SO₄^2- anion forms white precipitates of BaSO₄ .

Part 3 :-

Ionic equation of given reaction is :

2Na⁺(aq) + SO₄^2-(aq) + Ba²⁺(aq + 2Cl^-(aq) ---------------> BaSO₄(s) + 2Na⁺(aq) + 2Cl^-(aq)

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Net ionic equation after the cancellation of 2Na⁺(aq) and 2Cl^-(aq) ions on both sides is:

Ba²⁺(aq +  SO₄^2-(aq)   ---------------> BaSO₄(s)

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