Multiple Choice
Which of the following is a polyatomic ion?
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3. Chemical Reactions
Polyatomic Ions
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Which of the following is the correct chemical formula for the acetate ion?
A
CO3^{2-}
B
SO4^{2-}
C
NO3-
D
C2H3O2-
Verified step by step guidance1
Understand that the acetate ion is a common polyatomic ion derived from acetic acid (CH3COOH) by losing a hydrogen ion (H+).
Recall that the acetate ion contains two carbon atoms, three hydrogen atoms, and two oxygen atoms, with an overall charge of -1.
Compare the given options: CO3^{2-} is carbonate ion, SO4^{2-} is sulfate ion, NO3^- is nitrate ion; none of these match the composition of acetate.
Recognize that the correct chemical formula for the acetate ion is C2H3O2^- (sometimes written as CH3COO^-), reflecting its structure and charge.
Therefore, identify C2H3O2^- as the correct formula for the acetate ion based on its atomic composition and charge.
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