Statement-I: An aqueous solution of ammonium acetate can act as a buffer.

Statement-II: Acetic acid is a weak acid and ${\mathrm{NH}}_4\mathrm{OH} \mathrm{is} \mathrm{a} \mathrm{weak} \mathrm{base}.$

Ammonium acetate solution is a buffer formed by a weak acid and a weak base. When an acid is added to the buffer, the acetate ion from the salt combine with H₃​O⁺ to form acetic acid.

      CH₃​COO⁻+H₃​O⁺⇌ CH₃​COOH + H₂​O

When a base is added, the ammonium ion combine with OH⁻ to form ammonium hydroxide.

     NH₄^{+ ​}+ OH⁻ ⇌ NH_4​OH.