Select the single best answer what is the purpose of an acid-base buffer? oa. to maintain both relatively constant ph and pk, in a solution. ob. to maintain a relatively constant ph in a solution. c. none of these. d. to maintain a relatively constant pk, in a solution.

Option (B) is the correct answer.

Explanation:

An aqueous solution that consists of a mixture of weak base and its conjugate acid or a weak acid and its conjugate base is known as a buffer.

When we add a strong acid or base into this mixture then the change in pH of this mixture is very small.

In a buffer solution, pH depends on the ratio of concentration of base divided by concentration of acid.  

It is known that for a given temperature, the value of remains constant.

Therefore, relation between pH and will be as follows.

                    pH =

Thus, we can conclude that the purpose of an acid-base buffer is to maintain a relatively constant pH in a solution.

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