Multiple Choice
Which of the following lead compounds is completely soluble in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following salts would have the greatest solubility in water at room temperature?
A
NaNO_3
B
PbI_2
C
AgCl
D
BaSO_4
Verified step by step guidance1
Identify that the solubility of salts in water depends primarily on their solubility product constant, $K_{sp}$, which quantifies the extent to which the salt dissociates into its ions in solution.
Recall or look up the approximate $K_{sp}$ values for each salt: $PbI_2$, $AgCl$, $BaSO_4$, and $NaNO_3$. Higher $K_{sp}$ values indicate greater solubility.
Understand that $NaNO_3$ is a salt of a strong acid (HNO_3) and a strong base (NaOH), which typically results in very high solubility in water, often considered completely soluble.
Compare the $K_{sp}$ values of the slightly soluble salts ($PbI_2$, $AgCl$, $BaSO_4$) to the high solubility of $NaNO_3$ to determine which salt dissolves the most at room temperature.
Conclude that since $NaNO_3$ is highly soluble and the others have relatively low $K_{sp}$ values, $NaNO_3$ will have the greatest solubility in water at room temperature.
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