Which of the following is a buffer system?
A)NaCl(aq)and (aq)
B)HCl(aq)and NaOH(aq)
C) (aq)and (aq)
D)NaCl(aq)and NaOH(aq)
E) O(l)and HCl(aq)

Question

Which of the following is a buffer system?
A)NaCl(aq)and (aq) 
B)HCl(aq)and NaOH(aq) 
C) (aq)and (aq) 
D)NaCl(aq)and NaOH(aq) 
E) O(l)and HCl(aq)

Quizplus · Accepted Answer

Choice C is a buffer system because it contains both a weak acid (acetic acid) and its conjugate base (acetate ion). A buffer system is a solution that can resist changes in pH when small amounts of acid or base are added to it, and this is achieved by maintaining a balance between the weak acid and its conjugate base. The other choices do not contain a weak acid and its conjugate base, so they are not buffer systems.

Which of the Following Is a Buffer System