Aqueous solution of acetic acid contains:
(This question has multiple correct options)
A. CH3COO−

B. H3O+

C. CH3COOH

D. H+

To solve the question about the components of an aqueous solution of acetic acid, we need to analyze what happens when acetic acid (CH3COOH) is dissolved in water.

1. Acetic Acid in Water:

Acetic acid is a weak acid, which means it partially dissociates in water.
The dissociation can be represented by the following equilibrium reaction: CH3COOH (aq) ⇌ CH3COO− (aq) + H+ (aq)
2. Components in Solution:

When acetic acid is dissolved in water, the following species are present:
CH3COOH (Acetic Acid): The undissociated form of acetic acid will still be present in the solution since it is a weak acid.
CH3COO− (Acetate Ion): This is produced when acetic acid donates a proton (H+) to water.
H+ (Proton): This is generated during the dissociation of acetic acid.
H3O+ (Hydronium Ion): In aqueous solutions, free protons (H+) associate with water molecules to form hydronium ions (H3O+).
3. Correct Options:

A. CH3COO−: This is correct because acetate ions are formed when acetic acid dissociates.
B. H3O+: This is correct because hydronium ions are present in the solution as a result of the dissociation of acetic acid.
C. CH3COOH: This is correct because undissociated acetic acid remains in the solution.
D. H+: This is technically correct in the context of the dissociation reaction, but in aqueous solutions, it predominantly exists as H3O+. However, it is still present.
Final Answer: The correct options regarding the components of an aqueous solution of acetic acid are:

A. CH3COO−
B. H3O+
C. CH3COOH
D. H+
All options can be considered correct depending on the context of the question, as acetic acid in water contains all these species.