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Question

pH of a buffer solution varies with_________.


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Solution

Buffer solution:

  • The aqueous solution of a mixture of a weak acid and its conjugate base and vice-versa is termed a buffer solution.
  • pH of buffer solution varies with the equilibrium constant of a weak acid and the ratio of weak base to weak acid in the solution.
  • The equilibrium constant of an acid determines the dissociation acid and its conjugate base.
  • Different acids have a different equilibrium constant so the amount of dissociation of H+ ion varies.
  • The more H+ ions in the solution the more acidic the buffer will be and so lower will be the pH.
  • The ratio of acid to its conjugate base also affects the solution of the buffer.
  • If the ratio of conjugate base is higher then more number of OH- will be present in the buffer solution. so the solution will be basic and pH will be higher.

So, pH of a buffer solution varies with type of buffer.


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