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When aqueous barium chloride and sodium sulfate are mixed, which pair of ions combines to form the white precipitate?

Answer and explanation

Correct answer: \(\mathrm{Ba^{2+}}\) and \(\mathrm{SO_4^{2-}}\)

The correct pair is \(\mathrm{Ba^{2+}}\) and \(\mathrm{SO_4^{2-}}\). These ions form insoluble, white barium sulfate in water: \(\mathrm{Ba^{2+}(aq)+SO_4^{2-}(aq)\rightarrow BaSO_4(s)}\). \(\mathrm{Na^+}\) and \(\mathrm{Cl^-}\) remain as spectator ions in solution and do not form the white precipitate.

Related tags

Precipitation ReactionDouble DisplacementIonic EquationBarium SulfateChemical ReactionsEquations

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