Answer
$NaH_2PO_4$ and $Na_2HPO_4$ are capable of formating a buffer solution.
Work Step by Step
1. For a buffer solution, we need:
- 1 Weak acid: $H_2P{O_4}^-$
- 1 Weak base: $H{PO_4}^{2-}$.
2. They can't react with each other.
- Since they are a conjugate acid-base pair, that reaction will not happen.
Therefore, this pair can make a buffer solution.
