You have a solution of sodium iodide (Nal) and need to add something to it that will precipitate the iodine ions out while leaving the sodium ions in solution. According to the solubility chart below, which of these compounds would accomplish that?

A. Aluminum

nitrate (AIZNO3)

B. Silver nitrate

(AgNO3)

C. Sodium phosphate

(NazP04)

D. Sodium nitrate

(NaNO3)

D. Sodium nitrate (NaNO₃)

Explanation:

In solubility chat, nitrate (v) oxide (NO₃) is more electronegative than iodine ions.

A compound that will help to precipitate iodine ions out while leaving the sodium ions in solution, must contain nitrate (v) oxide (NO₃) because it displaces iodine in every iodide compound.

In order to ensure that only sodium ions remain in the solution, we must choose a compound that contains sodium metal.

Therefore, the only compound that matches these criteria is Sodium nitrate

(NaNO₃)

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they are all solids.