Question

When an aqueous solution contains both a weak acid (or weak base) and its conjugate base (or conjugate acid) it is called:

• A. buffer
• B. water
• C. neutral acid
• D. conjugate base

Answer 1

The correct option is A buffer

When an aqueous solution contains both a weak acid (or weak base) and its conjugate base (or conjugate acid) it is called a buffer solution.

A solution whose $pH$ does not change very much when an acid (or base) is added to it. The capacity of the buffer is a measure of how much acid (or base) must be added to it to change the $pH$ by one unit.