Aweak acid or base that reacts with strong acids or bases to prevent sudden changes in ph is called what?

Buffer controls the sudden change in the solution

Buffer prevents the sudden change in the pH. They keep the pH of the solution nearly constant. For example, in human Buffer solution helps to regulate the pH of human blood.  The normal pH of the human blood is nearly 7.35 to 7.45 and a little change in this pH many leads the serious problems. Carbonic and bicarbonate buffers play a role in maintaining the acid base balance of the blood.

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