Answer:
Explanation:
A buffer is defined as an aqueous mixture of a weak acid and its conjugate base or vice versa.
In the systems:
H₂CO₃(aq) and KHCO₃(aq): Carbonic acid, H₂CO₃, is a weak acid that, in solution with its conjugate pair, HCO₃⁻ make a buffer system.
NaCl(aq) and NaOH(aq): NaCl is a salt and NaOH is a strong base. Thus, this system is not a buffer system.
H₂O(l) and HCl(aq): Water is a solvent and HCl a strong acid. This is not a buffer system.
HCl(aq) and NaOH(aq): HCl is a strong acid and NaOH a strong base. This is not a buffer system.
NaCl(aq) and NaNO₃(aq): Both NaCl and NaNO₃ are salts and this system is not a buffer system.
