Question

question 2 of 10
what is the purpose of a buffer?
a. to limit ph changes in solution
b. to force the ph of a solution to change
c. to make a solution form a salt
d. to neutralize the ph of a solution

Explanation:

A buffer is a solution that resists changes in pH when small amounts of an acid or a base are added to it. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid. When an acid is added, the conjugate base in the buffer reacts with the added \(H^+\) ions. When a base is added, the weak acid in the buffer reacts with the added \(OH^-\) ions. This helps in limiting the pH changes in the solution.

• Option B is incorrect because buffers work against pH changes, not to force pH change.
• Option C is incorrect as the formation of a salt is not the purpose of a buffer. Buffers can be involved in reactions that may form salts as part of their action to resist pH change, but that's not their main purpose.
• Option D is incorrect. A buffer doesn't neutralize the pH of a solution to a particular fixed value like a neutralization reaction (where an acid and a base react to form salt and water and may neutralize the pH to 7 in case of strong acid - strong base neutralization). A buffer just limits the pH change within a certain range.

Answer:

A. To limit pH changes in solution