You are given an aqueous solution and are asked to analyze it for the presence (or absence) of Ag+(aq), Ca2+(aq), and/or Hg2+(aq
) ions. There are no other metal ions in the solution. You add aqueous hydrochloric acid (HCl) 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+(aq), and Hg2+(aq) (b) only Ag+(aq) and Hg2+(aq) (c) only Ca2+(aq) and Hg2+(aq) (d) only Ag+(aq) and Ca2+(aq) (e) only Hg2+(aq)
Two covalent bonds form between the two oxygen atoms because oxygen requires two shared electrons to fill its outermost shell. Nitrogen atoms will form three covalent bonds (also called triple covalent) between two atoms of nitrogen because each nitrogen atom needs three electrons to fill its outermost shell.
