Reaction between MEA (monoethanolamine) + CuSO4
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hoangnga0896
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Reaction between MEA (monoethanolamine) + CuSO4


Can anyone have an idea about reaction between monoethanolamine and copper sulfate pentahydrate (CuSO4.5H2O) ? I don't know the equation and exact products. Has anyone in this forum done the reaction before?
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ChenBeier
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Monoethanolamin is a derivat of ammonia. Cpperions react with it to form a complex [Cu(NH3)4] ²+ . Instead of the ammonia you can set in any amin.
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hoangnga0896
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Could you write full chemical equation for me? I still can not visualize because the equation is very important for calculation.
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ChenBeier
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What is the formula aqueaus complex of copper?
If you know this you exhchange water with the amin.
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hoangnga0896
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I think the equation could be
C2H7NO + CuSO4.5H2O = C2H5NOCu2+ + H2SO4 + H2O
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ChenBeier
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No

Copper ions in water are Cu(H2O)4 ²+

The water will exchange to the amin . The sulfate is not changed its spectator ion.

First step: Cu(H2O)4 ²+ + NH2-CH2-CH2OH => [Cu(H2O)3NH2-CH2-CH2-OH] ²+

This can happen until all water is exhanged.
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hoangnga0896
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Thanks a lot. I have 1 more question. If I continue putting H3PO3 into the solution, will complex react with acid phosphorus? Is this complex stable?
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ChenBeier
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It will react, complex only stable at pH 7 and higher.
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hoangnga0896
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If MEA is excess and H3PO3 is taken into the solution, what will complex react with first?
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ChenBeier
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The acid reacts with MEA until all is neutalized and also the complex is destroyed.
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Yeah. Thank you so much.
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