Multiple Choice
Which of the following is the correct formula for the hydrogen phosphate ion?
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3. Chemical Reactions
Polyatomic Ions
Multiple Choice
Which of the following is the correct chemical formula for the acetate polyatomic ion?
A
C_2O_4^{2-}
B
NO_3^-
C
CH_3COO^-
D
CO_3^{2-}
Verified step by step guidance1
Step 1: Understand what a polyatomic ion is — it is a charged species composed of two or more atoms covalently bonded, that acts as a single ion in chemical reactions.
Step 2: Review the given options and identify their common names and formulas: \(\mathrm{C_2O_4^{2-}}\) is oxalate, \(\mathrm{NO_3^-}\) is nitrate, \(\mathrm{CH_3COO^-}\) is acetate, and \(\mathrm{CO_3^{2-}}\) is carbonate.
Step 3: Recall that the acetate ion specifically has the formula \(\mathrm{CH_3COO^-}\), which consists of two carbon atoms, three hydrogen atoms, and two oxygen atoms with a single negative charge.
Step 4: Compare the formulas to confirm that \(\mathrm{CH_3COO^-}\) matches the acetate ion, while the others correspond to different polyatomic ions.
Step 5: Conclude that the correct chemical formula for the acetate polyatomic ion is \(\mathrm{CH_3COO^-}\).
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