A particulate-level snapshot shows a precipitation reaction in aqueous solution

CHEMISTRY · Single correct · A Level · Chemistry · Reactions of ions in aqueous solution · Reactions of ions in aqueous solution

Problem

A particulate-level snapshot shows a precipitation reaction in aqueous solution. • BEFORE mixing: 6 Na⁺ ions, 6 Cl⁻ ions, and 4 Ag⁺ ions are dispersed in the water. • AFTER the reaction is complete and the solid is removed: the solution contains 6 Na⁺ ions and 2 Cl⁻ ions; the separated solid consists of 4 formula units of an insoluble compound. Which net ionic equation is most consistent with these observations? (a)

Na^{+} + Cl^{-} \rightarrow NaCl(s)

(b)

Ag^{+} + Cl^{-} \rightarrow AgCl(s)

(c)

2Ag^{+} + 2Cl^{-} \rightarrow 2AgCl(s)

(d)

Ag^{+} + Cl^{-} \rightarrow AgCl(aq)

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