Buffer Capacity is the ranges of volume of acid or base which when added to the buffer can resit the change in pH. The three factor are (1)pKa or Pkb of the buffering component (2) concentration of the component and (3)the self-ionization of water which is independent of the presence or absence of buffering agents. Solution Buffer Capacity is the ranges of volume of acid or base which when added to the buffer can resit the change in pH. The three factor are (1)pKa or Pkb of the buffering component (2) concentration of the component and (3)the self-ionization of water which is independent of the presence or absence of buffering agents..