3. You are given an aqueous solution and are asked to analyze it for the presenc

Question

3. You are given an aqueous solution and are asked to analyze it for the presence (or absence) of Ag (aq), Ca? (ag), and/or Hg*(aq) ions. There are no other metal ions in the solution. You add aqueous hydrochloric acid (HCI) to the solution, and nothing appears to happen. You add aqueous sulfuric acid (H2SO4) to the solution, and a white precipitate forms. You remove (via filtration) the white precipitate, and then add aqueous hydrogen sulfide (H2S) to the solution that remains. A black precipitate forms. . Based on these observations, which ions are present in the original solution? (a) Ag'(aq), Ca2"(a), and Hg?(a) (b) only Ag (aq) and Hg (aq) (c) only Ca (aq) and Hg?'(aq) (d) only Ag (aq) and Ca2 (a) (e) only Hg2 (a)

Explanation / Answer

Had Ag+ been present it would have formed white precipitate of AgCl(s) when HCl is added.Since no give that precipitation occurs so no Ag+ is present.

With H2SO4 white precipitate formed confirms the presence of Ca2+as white precipitate of CaSO4 is formed.

When H2S is added black precipitate of HgS is formed.

Thus there are Ca2+ and Hg2+ present in the solution and answer is C.

Comment in case fo any doubt.

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