Multiple Choice
Which of the following salts would have the greatest solubility in water at room temperature?
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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 LiOH (lithium hydroxide) in aqueous solution?
A
K2SO4
B
NaNO3
C
FeCl2
D
NH4Br
Verified step by step guidance1
Identify the ions present in each compound when dissolved in water. For example, FeCl2 dissociates into Fe^{2+} and 2Cl^{-}, K2SO4 into 2K^{+} and SO4^{2-}, NaNO3 into Na^{+} and NO3^{-}, and NH4Br into NH4^{+} and Br^{-}.
Recall that LiOH dissociates completely into Li^{+} and OH^{-} ions in aqueous solution.
Determine which metal ions can form insoluble hydroxide precipitates with OH^{-} ions. Use solubility rules: most hydroxides are insoluble except those of alkali metals and some alkaline earth metals.
Check if Fe^{2+} forms an insoluble hydroxide with OH^{-}. Iron(II) hydroxide, Fe(OH)2, is known to be insoluble and will precipitate out of solution.
Conclude that mixing FeCl2 with LiOH will produce Fe(OH)2 precipitate, while the other compounds contain ions that form soluble hydroxides or salts with OH^{-} and thus will not precipitate.
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