AP BIOLOGY

Detailed explanation-1: -A buffer is a weak acid or base that prevents sudden changes in pH.

Detailed explanation-2: -Buffer, as we have defined, is a mixture of a conjugate acid-base pair that can resist changes in pH when small volumes of strong acids or bases are added. When a strong base is added, the acid present in the buffer neutralizes the hydroxide ions (OH-start superscript, start text, negative, end text, end superscript).

Detailed explanation-3: -A buffer is a solution that resists sudden changes in pH.

Detailed explanation-4: -The phosphate buffer system maintains the intracellular pH in all living organisms. In this buffer system, dihydrogen phosphate ions serve as the weak acid.

Detailed explanation-5: -Buffer is also defined as the solution of reserve acidity or alkalinity which resists change of pH upon the addition of a small amount of acid or alkali. Many chemical reactions are carried out at a constant pH.