Weak acids are able to act as chemical buffering systems for the body because they only partially dissociate.

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Weak acids only partially dissociate, which means they release ions (hydrogen ions, in this case) in small quantities. This makes them effective buffers because they can neutralize excess hydrogen ions in a solution without causing the pH to change drastically. In the body, weak acids such as carbonic acid and amino acids act as buffering systems to maintain a constant pH in the blood and other bodily fluids.

Weak Acids Are Able to Act as Chemical Buffering Systems