How does a buffer help a solution maintain pH?

Question

Quizplus · Accepted Answer

A buffer is a solution that is able to resist changes in pH when an acid or base is added to it. This is because a buffer system contains both a weak acid and its conjugate base (or a weak base and its conjugate acid) which can react with any added acid or base. If the pH of the solution decreases (becomes more acidic), the buffer system can shift towards the basic side and neutralize the added acid. If the pH of the solution increases (becomes more basic), the buffer system can shift towards the acidic side and neutralize the added base. Therefore, a buffer can act like a base if pH is acidic, and it can act like an acid if pH is basic. Option A is the correct answer. Option B and C are not accurate explanations of how a buffer works. Option D is incorrect because a buffer does not release acid to maintain proper pH, instead it reacts with any added acid or base.

How Does a Buffer Help a Solution Maintain PH