Which of the following particulate-level descriptions best represents an aqueous…

CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures

Problem

Which of the following particulate-level descriptions best represents an aqueous solution of

\text{NH}_4\text{NO}_3

after complete dissolution? (a) Pairs of

\text{NH}_4\text{NO}_3

units remain associated as neutral clusters, each cluster surrounded by several water molecules. (b) Equal numbers of intact polyatomic

\text{NH}_4^{+}

and

\text{NO}_3^{-}

ions are dispersed among water molecules oriented according to charge. (c)

\text{NH}_4^{+}

and

\text{NO}_3^{-}

ions are present, but there are twice as many

\text{NO}_3^{-}

ions as

\text{NH}_4^{+}

ions to maintain charge balance. (d) Separate

\text{N}^{3-}

and

\text{H}^{+}

ions in a

1{:}4

ratio together with isolated

\text{O}^{2-}

ions, all solvated by water molecules.