## Chemistry: The Molecular Science (5th Edition)

$HCl$ and $NaCl$ are not the best combination for a buffer with $pH \approx 9$, because $HCl$ is a strong acid, so this isn't a buffer solution.
- A strong acid $HCl$ and its conjugate base $Cl^-$ can't make a buffer solution, and its solution pH will be less than 7. (Acidic)