• A buffer is a solution of a weak acid or a base and its salt.
  • Both components must be present for the system to act as a buffer to resist changes in pH.
  • The buffer capacity is the amount of acid or base that can be added to a buffer solution before a large change in pH occurs.
  • Commercial buffer solutions, which have a wide variety of pH values, can be obtained.
  • Some common buffer systems are listed in the Table below:Table below:Some Common Buffers Guidelines.
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