Multiple Choice
Which of the following observations provides evidence that ionic bonds formed during a precipitation reaction?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following compounds is most soluble in water?
A
BaSO_4
B
AgCl
C
PbI_2
D
NaNO_3
Verified step by step guidance1
Understand that solubility in water depends on the compound's ability to dissociate into ions and interact with water molecules. Ionic compounds that are highly soluble typically have ions that are well stabilized by hydration.
Recall the solubility rules for common ionic compounds: most nitrates (NO_3^-) are soluble in water, while many sulfates (SO_4^{2-}), chlorides (Cl^-), and iodides (I^-) have varying solubility depending on the cation.
Examine each compound: BaSO_4, AgCl, and PbI_2 are all known to be sparingly soluble or insoluble in water due to the formation of strong ionic lattices and low hydration energy relative to lattice energy.
Recognize that NaNO_3 is a nitrate salt, and nitrates are generally very soluble in water because the nitrate ion is well stabilized by hydration and sodium ion is highly soluble.
Conclude that among the given options, NaNO_3 is the most soluble in water due to its ionic nature and the solubility rules favoring nitrates.
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