Question

A solution containing an ionic compound is subjected to the anion and cation confirmation tests performed...

A solution containing an ionic compound is subjected to the anion and cation confirmation tests performed in this experiment.
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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Answer #1

Purple colour is due to potassium ion.

Addition of silver nitrate: a bright yellow precipitate formed: this means iodide ion is present.

So the ionic compound is KI.

Full molecular equation:
AgNO3(aq) + KI(aq) → AgI(s) + KNO3(aq)

Full ionic equation:
Ag+(aq) + NO3-(aq) + K+(aq) + I-(aq) → AgI(s) + K+(aq) + NO3-(aq)

Now inspect this full ionic equation . Find everything that is identical on both sides of the → sign. These are the spectator ions which are: K+(aq) and NO3-(aq)
What is left is the net ionic equation:
Ag+(aq) + I-(aq) → AgI(s)

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