Two aqueous solutions are mixed

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

Problem

Two aqueous solutions are mixed. • Solution A contains equal numbers of K⁺ and SO₄²⁻ ions. • Solution B contains equal numbers of Ba²⁺ and NO₃⁻ ions. After mixing, the particulate diagram shows an insoluble solid composed only of Ba²⁺ and SO₄²⁻ ions, while K⁺ and NO₃⁻ ions remain uniformly dispersed in solution. Which balanced molecular equation best accounts for these observations? (a) 2 KNO3(aq)+BaSO4(s)→K2SO4(aq)+Ba(NO3)2(aq)2\,\text{KNO}_3(aq) + \text{BaSO}_4(s) \rightarrow \text{K}_2\text{SO}_4(aq) + \text{Ba(NO}_3)_2(aq) (b) K2SO4(aq)+Ba(NO3)2(aq)→BaSO4(aq)+2 KNO3(s)\text{K}_2\text{SO}_4(aq) + \text{Ba(NO}_3)_2(aq) \rightarrow \text{BaSO}_4(aq) + 2\,\text{KNO}_3(s) (c) K2SO4(aq)+Ba(NO3)2(aq)→BaSO4(s)+2 KNO3(aq)\text{K}_2\text{SO}_4(aq) + \text{Ba(NO}_3)_2(aq) \rightarrow \text{BaSO}_4(s) + 2\,\text{KNO}_3(aq) (d) K2SO4(aq)+Ba(NO3)2(aq)→BaSO4(s)+KNO3(aq)\text{K}_2\text{SO}_4(aq) + \text{Ba(NO}_3)_2(aq) \rightarrow \text{BaSO}_4(s) + \text{KNO}_3(aq)

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