CH3COOH(aq)+H2O(l)⇄H3O+(aq)+CH3COO− (aq) CH3COO−(aq)+H2O(l)⇄CH3COOH(aq)+OH−( aq)

2H2O(l)⇄H3O+(aq)+OH−(aq)

A buffer solution is made up of acetic acid (CH3COOH) and sodium acetate (NaCH3COO). The major equilibria in the buffer system are represented above. Which of the following equilibria could be used to support the claim that the addition of a small amount of NaOH to the buffer will result in only a very small change in pH?

CH3COOH(aq)+CH3COO−(aq)⇄CH3COO−(aq) +CH3COOH(aq)

C H 3 C O O H aqueous plus C H 3 C O O with a negative 1 charge aqueous is in equilibrium with C H 3 C O O with a negative 1 charge aqueous plus C H 3 C O O H aqueous
A

CH3COOH(aq)+OH−(aq)⇄CH3COO−(aq)+H2O (l)

C H 3 C O O H aqueous plus O H with a negative 1 charge aqueous is in equilibrium with a C H 3 C O O with a negative 1 charge aqueous plus H 2 O liquid
B

H3O+(aq)+OH−(aq)⇄2H2O(l)

H 3 O with a positive 1 charge aqueous plus O H with a negative 1 charge aqueous is in equilibrium with 2 H 2 O liquid
C

CH3COOH(aq)+H2O(l)⇄H3O+(aq)+CH3COO− (aq)