Equal volumes (50 mL each) of 0.10 M and 0.10 M are mixed

CHEMISTRY · Single correct · AP · Chemistry · Chemical Reactions · Chemical Reactions

Problem

Equal volumes (50 mL each) of 0.10 M

\text{Na}_2\text{CO}_3(aq)

and 0.10 M

\text{BaCl}_2(aq)

are mixed. Solid

\text{BaCO}_3

precipitates and settles out. Which particulate-level description best represents the species that should appear in a diagram of the remaining solution above the solid? (a) Only

\text{Na}^{+}

ions solvated by water remain; the

\text{Cl}^{-}

ions have precipitated with

\text{Ba}^{2+}

as solid

\text{BaCl}_{2}

. (b) Solvated

\text{Na}^{+},\;\text{Cl}^{-},\;\text{CO}_{3}^{2-}

ions are present; no

\text{Ba}^{2+}

ions remain in the solution. (c) Only

\text{Na}^{+}

and

\text{Cl}^{-}

ions in roughly equal numbers, each solvated by water molecules; no

\text{Ba}^{2+}

\text{CO}_{3}^{2-}

ions remain in solution. (d) Solvated

\text{Na}^{+},\;\text{Cl}^{-},\;\text{Ba}^{2+}

ions are present in equal numbers;

\text{CO}_{3}^{2-}

ions are absent because all carbonate precipitated.

Related theory

Browse the problem library