Suppose you were given an unknown solution containing an unknown anion(s). You t

Question

Suppose you were given an unknown solution containing an unknown anion(s). You tested this solution using the same tests outlined and performed in this experiment. The results of these tests and observations are summarized as follows: Upon the addition of a few drops of sulfuric acid, no effervescence was observed, and no smells were observed. Upon the addition of a few drops of silver nitrate solution, no precipitates were observed. No discoloration was observed when a few drops of sodium nitrate solution was added with an excess (10 drops) of iron(II) nitrate solution. Upon the addition of a few drops of barium sulfate solution, a white precipitate formed. This white precipitate then dissolved when a few drops of hydrochloric acid were added. Based on this information, which ion (if any) is present in your unknown solution? Explain your reasoning.

Explanation / Answer

Answer:

   Test Test Result Present Ion

sulfuric acid - Negative test - It indicates the absence of NO2- group

AgNO3 - Negative test - Absence of Cl-

Sodium nitrate and - Negative test - Absence of S2-

[Sodium nitroprusside Test]

BaSO4 solution - White precipitate - SO42-

Note: BaSO4 forms as a white precipitate. To this precipitate the addition of the HCl it reacts with the BaSO4 and forms soluble BaCl2.

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