A mixture of a weak acid and its conjugate base forms a(n)
A)acid-base indicator.
B)buffer.
C)antacid.
D)acid rain.

Question

Quizplus · Accepted Answer

A mixture of a weak acid and its conjugate base acts as a buffer solution, which resists changes in pH when small amounts of acid or base are added to it. This is because the weak acid can accept and the conjugate base can donate protons, allowing them to neutralize added acid or base and maintain pH within a certain range. Acid-base indicators are compounds that change color over a certain pH range, antacids are substances used to neutralize stomach acid, and acid rain is a precipitation that has a low pH due to air pollutants.

A Mixture of a Weak Acid and Its Conjugate Base