Multiple Choice
In the context of solubility rules, what does it mean when a substance is described as 'soluble' in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which one of the following compounds would form a precipitate when mixed with aqueous Ba(NO3)2?
A
NH4NO3
B
LiBr
C
Na2SO4
D
KCl
Verified step by step guidance1
Identify the ions present in aqueous Ba(NO3)2. It dissociates into Ba^{2+} and NO_3^{-} ions in solution.
Consider each compound and determine the ions they produce when dissolved in water: NH_4NO_3 gives NH_4^{+} and NO_3^{-}, LiBr gives Li^{+} and Br^{-}, Na_2SO_4 gives Na^{+} and SO_4^{2-}, and KCl gives K^{+} and Cl^{-}.
Recall the solubility rules, especially that most sulfate salts are soluble except those with Ba^{2+}, Pb^{2+}, Hg_2^{2+}, and Ca^{2+}, which form precipitates.
When Ba^{2+} ions from Ba(NO_3)_2 meet SO_4^{2-} ions from Na_2SO_4, they form BaSO_4, which is insoluble and precipitates out of solution.
For the other compounds, their ions do not form insoluble salts with Ba^{2+}, so no precipitate forms when mixed with Ba(NO_3)_2.
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