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Under which conditions would the solubility of a gas in water be greatest?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following substances is soluble in water?
A
BaSO_4
B
PbI_2
C
AgCl
D
NaNO_3
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Recall the general solubility rules for ionic compounds in water, which help predict whether a substance will dissolve.
Note that most nitrates (NO_3^-) are soluble in water without exception, so NaNO_3 is expected to be soluble.
Check the solubility of sulfates (SO_4^{2-}): while many sulfates are soluble, BaSO_4 is an exception and is generally insoluble.
Consider halides (like I^- and Cl^-): many are soluble, but PbI_2 and AgCl are known to be poorly soluble or insoluble in water.
Conclude that among the given substances, NaNO_3 is soluble in water due to the nitrate ion's high solubility, while BaSO_4, PbI_2, and AgCl are not.
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