Multiple Choice
Why might arsenic be able to substitute for phosphorus in polyatomic ions?
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- 1. Intro to General Chemistry3h 48m
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3. Chemical Reactions
Polyatomic Ions
Multiple Choice
Which polyatomic ion has a charge of 3–?
A
Nitrate (NO_3^{-})
B
Sulfate (SO_4^{2-})
C
Phosphate (PO_4^{3-})
D
Carbonate (CO_3^{2-})
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Verified step by step guidance1
Review the charges of common polyatomic ions to understand their typical charges.
Recall that nitrate (NO_3) has a charge of 1–, written as \(NO_3^{1-}\) or simply \(NO_3^{-}\).
Recognize that sulfate (SO_4) and carbonate (CO_3) both have charges of 2–, written as \(SO_4^{2-}\) and \(CO_3^{2-}\) respectively.
Identify that phosphate (PO_4) is the polyatomic ion with a charge of 3–, written as \(PO_4^{3-}\).
Conclude that among the given options, phosphate is the ion with a 3– charge.
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