Before mixing

CHEMISTRY · Subjective · A Level · Chemistry · Reactions of ions in aqueous solution · Reactions of ions in aqueous solution

Problem

Before mixing, one beaker contains 3 Ba2+\mathrm{Ba^{2+}} ions and 6 Cl−\mathrm{Cl^{-}} ions, while a second beaker contains 3 SO42−\mathrm{SO_{4}^{2-}} ions and 6 K+\mathrm{K^{+}} ions. After mixing, an insoluble solid forms and the aqueous phase now holds 6 Cl−\mathrm{Cl^{-}} ions and 6 K+\mathrm{K^{+}} ions; no Ba2+\mathrm{Ba^{2+}} or SO42−\mathrm{SO_{4}^{2-}} ions remain in solution. Explain why the particulate information shows that Cl−\mathrm{Cl^{-}} ions act as spectators.

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