Question

Which is the best description of the chemical reaction shown here in aqueous solution? ch3ch2cooh (aq) ↔ ch3ch2coo- (aq) + h+ (aq)?

Answer 1

The given reaction: 
ch3ch2cooh (aq) ↔ ch3ch2coo- (aq) + h+ (aq)
is called a reversible reaction.

This means that, the reaction does not reach an end point.
In this type of reactions, reactants react together to form products, while products combine together to form reactants.
So, the reaction proceeds in both direction forming both reactants and products.

Answer 2

Answer is: this chemical reaction is dissociation of acid.

Chemical reaction of dissociation of propanoic acid:

CH₃CH₂COOH(aq) ⇄ CH₃CH₂COO⁻(aq) + H⁺(aq).

In aqueous solution propanoic acid dissociates (covalent bond between an electronegative oxygen atom and a hydrogen atom is broken by heterolytic fission) into conjugate base (anion CH₃CH₂COO⁻) of the acid and a hydrogen cation (H⁺).

Dissociation is a process in which molecules) separate into smaller particles such as atoms or ions.