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Multiple Choice
Which of the following ionic compounds is soluble in water?
A
PbI_2
B
AgCl
C
BaSO_4
D
NaNO_3
Verified step by step guidance
1
Understand the concept of solubility rules for ionic compounds in water. These rules help predict whether a compound will dissolve in water based on the ions it contains.
Recall that most nitrates (NO_3^-) are soluble in water regardless of the cation. This is a key general solubility rule.
Examine the given compounds: PbI_2 (lead iodide), AgCl (silver chloride), BaSO_4 (barium sulfate), and NaNO_3 (sodium nitrate).
Apply the solubility rules: PbI_2 and AgCl are generally insoluble or sparingly soluble in water, BaSO_4 is also mostly insoluble, while NaNO_3 is soluble due to the nitrate ion.
Conclude that NaNO_3 is the soluble compound in water because it contains the nitrate ion, which is known to form soluble salts with almost all cations.