Question

Which of the following can form buffer solution?

• A. A $NH _{3}+ NH _{4} OH$
• B. $KOH + HNO _{3}$
• C. $NaOH + HCl$
• D. $KI + KOH$

Answer 1

Answer: (A)

A $NH _{3}+ NH _{4} OH$

Answer 2

$Ag \cdot NH _{3}+ NH _{4} OH$
because buffer solution is an aquous solution consisting of a minture of a weak acid and its conjugate base.