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Synthesize of tetrapotassium iminodisuccinate in three following steps: addition water to the maleic anhydride makes maleic acid. koh was added gradually, then, ammonium bicarbonate was added gradually stirring for 1 hour at 50°c. the last step: stirring for 0.5 hour at 110 c for the cyclization process. what is best ph for reaction of ammonium with potassium maleate?
Accepted Answer
The optimal pH for the reaction of ammonium bicarbonate with potassium maleate to form the iminodisuccinate complex is around 8-9. Here's why:
1. Ammonium Bicarbonate Decomposition: Ammonium bicarbonate (NH4HCO3) decomposes into ammonia (NH3), carbon dioxide (CO2), and water (H2O) upon heating. The ammonia acts as the key reagent for the imine formation.
2. Potassium Maleate: Potassium maleate (K2C4H2O4) is the salt of maleic acid, a dicarboxylic acid. In solution, it provides maleate anions (C4H2O4^2-).
3. Imine Formation: The reaction occurs between the ammonia and the maleate anion. The optimal pH range of 8-9 ensures sufficient ammonia concentration for the reaction. A lower pH will result in less ammonia, hindering imine formation. A higher pH could lead to hydrolysis of the imine product.
It's important to note that the actual pH might slightly vary depending on the concentration of the reactants and other reaction conditions.
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