Question

NH3–NH4Cl is a/an _______ that helps regulate the pH of a system.

A. base

B. buffer

C. acid

D. neutral solution

Answer 1

NH3–NH4Cl is a/an Buffer that helps regulate the pH of a system.

A buffer solution ( pH buffer or hydrogen ion buffer) is an aqueous solution consisting of a mixture of a weak acid and its salt formed from conjugate base, or weak base and its salt formed from conjugate acid.

Acidic Buffer : Consisting of a mixture of a weak acid and its salt formed from conjugate base.

Basic Buffer : Consisting of a mixture of a weak base and its salt formed from conjugate acid.

The given solution is NH3-NH4Cl is Basic buffer which is composed of weak base(NH3 ammonia) and a salt(NH4Cl ammonium chloride) formed from its conjugate acid(HCl hydrochloric acid).

`NH_(3)(Weak base) + HCl(Conjuagte acid)\rightarrow NH_(4)Cl(Salt)`

`NH_(3)-NH_(4)Cl`composed of weak base and its salt and is considered as Basic Buffer.