Question

What reaction that occurs when HCl is added to a buffer solution composed of HC2H3O2 and NaC2H3O2.

What reaction that occurs when  is added to a buffer solution composed of  and .

As HCl (H− and Cl+) is added, the H− will pair with C2H3O−2, neutralizing the acetate ion and becoming acetic acid.
As HCl (H+ and Cl−) is added, the H+ will pair with HC2H3O2, neutralizing the acetate ion and becoming an acetic base.,
As HCl (H+ and Cl−) is added, the H+ will pair with NaC2H3O2, neutralizing the acetate ion and becoming acetic acid.
As HCl (H+ and Cl−) is added, the H+ will pair with C2H3O−2, neutralizing the acetate ion and becoming acetic acid.

PART B

How does the buffer keeps the pH approximately the same even though a strong acid is added

Since acetic acid is a strong acid, it will remain primarily undissociated and the amount of H+ ions in solution will not significantly change.

Since acetic acid is a weak acid, it will completely dissociated and the amount of H+ ions in solution will significantly change.

Since acetic acid is a strong acid, it will remain primarily undissociated and the amount of H+ ions in solution will significantly change.

Since acetic acid is a weak acid, it will remain primarily undissociated and the amount of H+ ions in solution will not significantly change.

Answer 1

Part A)

Answer :

As HCl (H+ and Cl−) is added, the H+ will pair with C2H3O−2, neutralizing the acetate ion and becoming acetic acid.

C2H3O2- (aq) +   H+ (aq)    ---------------> HC2H3O2 (aq)

H+ reacts with acetate ion to forms acetic acid .

Part B)

Answer :

Since acetic acid is a weak acid, it will remain primarily undissociated and the amount of H+ ions in solution will not significantly change.