Question

An aqueous solution of $1M \,NaCl$ and $1M \,HCl$ is:

• A. not a buffer but $pH < 7$
• B. not a buffer but $pH > 7$
• C. a buffer with $pH < 7$
• D. a buffer with $pH > 7$

Answer 1

Answer: (A)

$NaCl$ is salt of strong acid and strong base. Its not the case of buffer.

$NaCl + H _{2} O \rightleftharpoons NaOH + HCl$

aqueous $NaCl$, itself exact neutral solution

$HCl + H _{2} O \rightleftharpoons H _{3} O ^{+}+ Cl ^{-}$

makes solution acidic.