Multiple Choice
Which of the following is a consequence of dissolving a solid in a liquid?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following solutions will form a precipitate when mixed with a solution of aqueous Ba(NO3)2?
A
KCl(aq)
B
NH4NO3(aq)
C
LiBr(aq)
D
Na2SO4(aq)
Verified step by step guidance1
Identify the ions present in the Ba(NO3)2 solution. Ba(NO3)2 dissociates into Ba^{2+} and NO3^{-} ions in aqueous solution.
List the ions present in each of the other solutions: KCl contains K^{+} and Cl^{-}, NH4NO3 contains NH4^{+} and NO3^{-}, LiBr contains Li^{+} and Br^{-}, and Na2SO4 contains Na^{+} and SO4^{2-}.
Recall the solubility rules to determine which combinations of ions form an insoluble compound (precipitate). Most nitrate (NO3^{-}) salts are soluble, and most alkali metal salts (like K^{+}, Na^{+}, Li^{+}) are soluble. BaSO4 is known to be insoluble.
Predict the possible precipitate by combining Ba^{2+} with the anions from each solution. Ba^{2+} with SO4^{2-} forms BaSO4, which is insoluble and will precipitate.
Conclude that mixing Ba(NO3)2 with Na2SO4 will form a precipitate of BaSO4, while mixing with KCl, NH4NO3, or LiBr will not form a precipitate because their combinations with Ba^{2+} are soluble.
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