Multiple Choice
Which of the following is the conjugate base of the dihydrogen phosphate ion, H2PO4-?
75
views
3. Chemical Reactions
Polyatomic Ions
Multiple Choice
Which of the following is the correct name for the polyatomic ion CH3CO2-?
A
Formate
B
Oxalate
C
Acetate
D
Nitrate
Verified step by step guidance1
Identify the molecular formula of the polyatomic ion given: CH3CO2-. This ion consists of a methyl group (CH3) attached to a carboxylate group (CO2-).
Recall common polyatomic ions and their names. For example, formate is HCO2-, oxalate is C2O4^2-, nitrate is NO3-, and acetate is CH3CO2-.
Compare the given ion CH3CO2- to the known ions. Notice that CH3CO2- matches the structure of acetate, which is the conjugate base of acetic acid (CH3COOH).
Understand that formate (HCO2-) is the conjugate base of formic acid, oxalate (C2O4^2-) is a different ion with two carboxylate groups, and nitrate (NO3-) is unrelated to the given formula.
Conclude that the correct name for CH3CO2- is acetate, based on its structure and common nomenclature of polyatomic ions.
Related Videos
Related Practice
