Buffering Capacity  - The concept of buffering capacity comes from acid-base solution chemistry.  In quantitative terms, buffering capacity is the amount of acid (or base) that can be added to a solution without changing the solution pH.  Pure water has essentially no buffering capacity so a drop of acid into a cup of pure water could change the pH from 7 to 3.  The same amount of acid added to a well-buffered solution wouldn’t cause any change in pH of the solution.

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