Why do buffers resist pH change?
Because they introduce a means for the solvent to sop up excess
This equation is well-known:
Thus given quantities of acid and conjugate base, added
When a weak acid is titrated by a strong base, or a strong acid by a weak base, a buffer is formed initially, and this region of the graph of
Biological systems are extensively buffered, to reduce gross changes in
For a fuller treatment, see this old answer.