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In: Chemistry

Suggest some possibilities as to why your buffer pH might not be exactly 8.0

Suggest some possibilities as to why your buffer pH might not be exactly 8.0

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Expert Solution

    Buffer solution is a aqueous solution consisting of a mixture of a weak acid and its conjugate base or vice versa.

    conjugate base is a species formed from an acid after donating a proton to base.

   Example :      HO-​ +  H​3NH​+ ​    <---->    H2​O              +        NH3      

                       Base      Acid                   Conjugate acid     conjugate base

​   Buffer solutions are used as means of keeping pH at a nearly constant value when a strong alkali or acid is added to it.


   pH of Buffer need not be exactly 8.0.   There are different buffer solution which are available or can be created to be used for mainting pH constantly at any pH value ranging from 3 - 8.

usually Buffer can be classified as acidic, alkaline or nuetral buffers, depending on the pH of the buffer.Acidic buffer will have pH less than 7 , Basic buffer will have pH more than 7 and nuetral buffer will have pH around 7.


Some examples of acids which with thier conjugate base can be used to prepare acidic buffer   

Acidic buffer

 pH Range
citric acid buffer 2-7
acetic acid buffer 3.8-5.8

Some examples of base which with thier conjugate acid can be used to prepare basic buffer   

Alkaline buffer pH range
      Borate 8.2-10.2
CHES 8.3-10.3​

  Citric acid in combination with Disodium Hydrogen Phosphate can be used to prepare Buffer solution of wide range of pH ranging from 2-8 by just varying the concentrations of the Citric acid and Disodium Hydrogen Phosphate in the mixture. This buffer is called universal buffer or Mclvaine's buffer


pH range of buffer can be taken to pH of wide range by mixing two buffer.

queen_honey_blossom answered 1 year ago
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