Question

What do you mean by buffer solution?

• A. Buffer solution have no $pH$
• B. Its $pH$ changes very little when a small amount of acid or base is added to the it
• C. Its $pH$ changes very largely when a small amount of acid or base is added to the it
  
• D. All solutions are buffer

Answer 1

The correct option is B Its $pH$ changes very little when a small amount of acid or base is added to the it

It's $pH$ changes very little when a small amount of strong acid or base is added to it.

Buffer solutions are used as a means of keeping $pH$ at a nearly constant value in a wide variety of chemical applications. In nature, there are many systems that use buffering for $pH$ regulation. For example, the bicarbonate buffering system is used to regulate the $pH$ of blood.