The short answer to this question is that a pH buffer is a solution that resists changes in pH when acids or bases are added. To understand this more fully, a deeper dive into the science of pH buffers is necessary.

What is a pH Buffer?

A pH buffer is a solution with a specific pH that resists changes when acids or bases are added to it. It is composed of a weak acid and its conjugate base (or vice versa) in an appropriate ratio. The weak acid and its conjugate base help to maintain the pH of the buffer by reacting with any strong acids or bases that are added to the solution. This helps to keep the pH of the solution relatively constant.

What Are the Benefits of pH Buffers?

The primary benefit of pH buffers is their ability to resist changes in pH when acids or bases are added. This makes them ideal for use in medical and scientific processes where maintaining a specific pH is essential. For example, laboratory experiments often require the use of a buffer to keep the pH of the solution constant throughout the experiment.

In addition, pH buffers can also be used to help protect living organisms from the effects of acidic or alkaline conditions. This is because the buffer helps to control the pH of the environment and keep it within a certain range.

Conclusion

In summary, a pH buffer is a solution with a specific pH that resists changes when acids or bases are added to it. This makes them ideal for use in medical and scientific experiments, as well as for helping to protect living organisms from the effects of acidic or alkaline conditions. Thus, the statement which is true of pH buffers is that they resist changes in pH when acids or bases are added.