Multiple Choice
Which property is the basis of the purification technique recrystallization?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which one of the following compounds is soluble in water?
A
NaNO_3
B
AgCl
C
BaSO_4
D
PbSO_4
Verified step by step guidance1
Recall the general solubility rules for ionic compounds in water, which help predict whether a compound will dissolve or not.
Note that nitrates (NO_3^-) are generally soluble in water regardless of the cation, so compounds like NaNO_3 are expected to be soluble.
Recognize that silver chloride (AgCl) is typically insoluble in water due to the low solubility of most silver halides.
Understand that sulfates (SO_4^{2-}) are usually soluble, but exceptions include barium sulfate (BaSO_4) and lead sulfate (PbSO_4), which are poorly soluble.
Conclude that among the given options, NaNO_3 is soluble in water because it contains the nitrate ion, which is always soluble, while the others are insoluble or sparingly soluble.
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