Multiple Choice
Oil molecules are nonpolar. Which type of solvent is most effective for removing an oil stain?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following compounds is soluble in water?
A
BaSO_4
B
NaNO_3
C
AgCl
D
PbI_2
Verified step by step guidance1
Understand the general solubility rules for ionic compounds in water. These rules help predict whether a compound will dissolve in water based on its ions.
Recall that most nitrates (NO_3^-) are soluble in water regardless of the cation. Therefore, compounds containing the nitrate ion, such as NaNO_3, are typically soluble.
Recognize that sulfates (SO_4^{2-}) are generally soluble, but there are exceptions. For example, BaSO_4 is an exception and is known to be insoluble in water.
Note that halides (Cl^-, I^-) are usually soluble, but silver (Ag^+) and lead (Pb^{2+}) halides like AgCl and PbI_2 are exceptions and tend to be insoluble or only slightly soluble.
Based on these rules, identify NaNO_3 as the compound that is soluble in water, while BaSO_4, AgCl, and PbI_2 are insoluble or sparingly soluble.
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