Question

Sodium hydroxide (NaOH) and elemental sodium (Na)

acetic acid (CH3CO2H) and hydrochloric acid (HCl)

acetic acid (CH3CO2H) and ammonia (NH3)

ammonia (NH3) and ammonium chloride (NH4Cl)

Answer 1

If the question is which can make a buffer, then NH3, NH4Cl should be correct. Because Ammonium (NH4) is conjugate acid of NH3 so they can form an equilibrium which is basically a buffer whose purpose is to resist pH change.

Step-by-step explanation: