AP Chemistryeasymcq1 pt
Mixing which pair of aqueous solutions produces BaCO₃(s) as a precipitate?
A.BaCl₂ and K₂CO₃
B.Na₂CO₃ and KNO₃
C.BaCl₂ and KNO₃
D.Ba(OH)₂ and KCl
Explanation
Core Concept
Both starting salts dissolve completely, releasing Ba²⁺ and CO₃²⁻ into the mixture. Carbonates are insoluble except when partnered with Group 1 or ammonium ions, and barium qualifies for no exception, so barium carbonate drops out immediately. The routine is always the same: predict the two possible ion pairings, then consult the solubility rules to see which product is solid.
Correct Answer
ABaCl₂ and K₂CO₃
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