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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 guidance
1
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.