Multiple Choice
Which of the following substances has the greatest solubility in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
Multiple Choice
Which of the following anions typically form compounds that are usually soluble in water?
A
PO_4^{3-} (phosphate)
B
CO_3^{2-} (carbonate)
C
NO_3^- (nitrate)
D
SO_4^{2-} (sulfate)
Verified step by step guidance1
Understand the concept of solubility rules in water, which help predict whether ionic compounds dissolve in water based on their constituent ions.
Recall that nitrate ion (\(NO_3^-\)) compounds are generally soluble in water without exceptions, making \(NO_3^-\) a reliable indicator of solubility.
Recognize that phosphate (\(PO_4^{3-}\)) and carbonate (\(CO_3^{2-}\)) ions typically form insoluble compounds with most cations, except for some alkali metals and ammonium.
Note that sulfate (\(SO_4^{2-}\)) compounds are mostly soluble, but there are notable exceptions such as barium sulfate and lead sulfate, which are insoluble.
Conclude that among the given anions, \(NO_3^-\) (nitrate) is the one that typically forms compounds that are usually soluble in water.
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