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29 August, 01:55

does a reaction occur when an aqueous solution of calcium iodide and sodium sulfate are combined. If a reaction does occur write the net ionic equation.

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  1. 29 August, 05:27
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    Yes. Ca²⁺ (aq) + SO₄²⁻ (aq) ⟶ CaSO₄ (s)

    Step-by-step explanation:

    The possible reaction is

    CaI₂ + Na₂SO₄ ⟶ CaSO₄ + 2NaI

    To predict a reaction, you must know the solubility rules.

    The important ones for this question are

    Salts containing Na⁺ are soluble. Thus, NaI is soluble. Most sulfates are soluble, but CaSO₄ is not. Thus, CaSO₄ is a precipitate, and a reaction occurs.

    Molecular equation

    CaI₂ (aq) + Na₂SO₄ (aq) ⟶ CaSO₄ (s) + 2NaI (aq)

    Ionic equation

    Ca²⁺ (aq) + 2I⁻ (aq) + 2Na²⁺ (aq) + SO₄²⁻ (aq) ⟶ CaSO₄ (s) + 2Na⁺ (aq) + 2I⁻ (aq)

    Net ionic equation

    Cancel all ions that appear on both sides of the reaction arrow (underlined).

    Ca²⁺ (aq) + 2I⁻ (aq) + 2Na²⁺ (aq) + SO₄²⁻ (aq) ⟶ CaSO₄ (s) + 2Na⁺ (aq) + 2I⁻ (aq)

    The net ionic equation is

    Ca²⁺ (aq) + SO₄²⁻ (aq) ⟶ CaSO₄ (s)
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