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8 June, 12:40

A solution containing an ionic compound is subjected to the anion and cation confirmation tests performed in this experiment, providing the following results: Addition of silver nitrate: a bright yellow precipitate formed. Flame test: a purple color was observed. Identify the ionic compound and write the chemical reaction that occurs when the ionic compound interacts with the silver nitrate. Identify the spectator ions.

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  1. 8 June, 13:55
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    The spectator ions are K⁺ and NO₃⁻, since these ions do not involve in any reaction.

    Explanation:

    It is given that a bright yellow precipitate will be formed when the given substance reacts with silver nitrate. Silver nitrate reacts with anion iodide (I⁻) to form yellow precipitate.

    In the flame test, if we get purple color then the cation must be Potassium (K⁺).

    So if we combine the cation and anion we will get the compound as Potassium Iodide (KI).

    K⁺ + I⁻ + Ag⁺ + NO₃⁻ → KNO₃ + AgI (s) ↓

    Here Silver and Iodide ions combine to form a precipitate and Potassium and nitrate ions are acting as spectator ions, which do not involve in the reaction.
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