Problem 5.3: Why is bicarbonate considered a buffer What
From Chapter 5 Problem Set. Level 1: Conceptual Mastery.
Question
Why is bicarbonate considered a buffer? What dual role does it play?
Answer
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Bicarbonate can absorb hydrogen (becoming carbonic acid) when acid is added, or donate hydrogen (becoming carbonate) when base is added. This dual role allows it to resist pH change in both directions, which is the definition of a buffer.