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Topic: ACID CATALYST/BUFFER SYSTEM  (Read 4350 times)

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Offline jmarjorie

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« on: October 11, 2004, 10:21:40 AM »
Dear Collegues,

A compound contains the following substances with the corresponding functions :

1) Malic acid ( Function : organic acid catalyst)
2) Sodium Hexametaphosphate (Function : Inorganic  
   buffering agent)

      MALIC ACID                    CITRIC ACID

           COOH                          CH2-COOH
      HO-C-H                       HO-C-COOH
           CH2                            CH2-COOH

- Can Malic acid be substituted by Citric acid for
this purpose as an organic acid catalyst ?
Citric acid is very similar in structure to Malic acid
Both are metabolites in Krebs/Citric acid cycle

- Can Sod.Hexametaphosphate be substituted by sodium
citrate as the buffering agent ?
Citric acid/Sodium Citrate buffer

Aim is to achieve dual purpose of citric acid : As an
organic acid catalyst and buffering agent.
Is this possible?

Thanks in advance,

Offline AWK

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« Reply #1 on: October 12, 2004, 01:34:26 AM »
Catalyst shows specific properties in some reactions depending on its mechanism of action.
So you should specify problem more precisely.
Buffer solution usually contain two reagents which are conjugated acid-base pairs according to Bronsted-Lowry theory. So, simple substitution cannot always work.

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