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Question

What makes a good buffer solution?


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Solution

Buffer solution:

  • “The solutions which resist change in pH on dilution or with the addition of small amounts of acid are called Buffer Solutions.”
  • It is a mixture of a weak acid and its conjugate base or vice versa.

Characteristics of a good buffer solution:

  • It should have a pKa between 6 to 8.
  • It should be soluble in water.
  • It should have minimal salt effects.
  • It should have minimal effects on dissociation from changes in concentration and temperature.
  • It should have well defined or nonexistent interactions with mineral cations.
  • It should be chemically stable.
  • It should not absorb UV light at the wavelengths used in photometric experiments.
  • It should be easy to use and prepare.

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