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Basically EDTA is Ethylene Diamine Tetra Acetic Acid. The four - charges will be on the four acid functional groups and two will bond to each zinc ion. I have drawn it out for you.
Marcus
Marcus
sorry Marcus, but EDTA is hexadentate and consequently has six points of connection with the metal ion, two from the nitrogen lone pairs and one each from the negative charges on the four carboxylate groups. The EDTA literally wraps itself around the metal ion in an octahedral manner.
Zn2+ + EDTA --> [ZnEDTA]2- + 4H+
Zn2+ + EDTA --> [ZnEDTA]2- + 4H+
OK I've had a go at drawing it (I'm trying to learn how to use Fireworks, so be kind!)
EDTA always reacts in a 1:1 ratio with metal ions
The blue lines represent the coordinate bonds to the metal ion.
EDTA always reacts in a 1:1 ratio with metal ions
The blue lines represent the coordinate bonds to the metal ion.
charco
sorry Marcus, but EDTA is hexadentate and consequently has six points of connection with the metal ion, two from the nitrogen lone pairs and one each from the negative charges on the four carboxylate groups. The EDTA literally wraps itself around the metal ion in an octahedral manner.
Zn2+ + EDTA --> [ZnEDTA]2- + 4H+
Zn2+ + EDTA --> [ZnEDTA]2- + 4H+
Thats great thanks
Maybe I can get a half decent mark on my lap report now despite the experiment not working (even though I followed the instructions carefully and correctly) and only getting one result.
charco
OK I've had a go at drawing it (I'm trying to learn how to use Fireworks, so be kind!)
EDTA always reacts in a 1:1 ratio with metal ions
The blue lines represent the coordinate bonds to the metal ion.
EDTA always reacts in a 1:1 ratio with metal ions
The blue lines represent the coordinate bonds to the metal ion.
That picture rocks!
charco
sorry Marcus, but EDTA is hexadentate and consequently has six points of connection with the metal ion, two from the nitrogen lone pairs and one each from the negative charges on the four carboxylate groups. The EDTA literally wraps itself around the metal ion in an octahedral manner.
Zn2+ + EDTA --> [ZnEDTA]2- + 4H+
Zn2+ + EDTA --> [ZnEDTA]2- + 4H+
Yeah, that's right. Can't imagine what I was thinking. Mind you, had been a long day at work. Now deleted the erroneous post.
Marcus
supreme
This is probably a silly question (sorry!) but where does the double bond arise from as we only have CH2CH2.
not a silly question - I looked at the old name Ethylene Diamine Tetra Acetic acid and assumed that the structure was based on ethylene CH2=CH2
In fact as I now realise this is incorrect and there is no double bond!
The new name is 1,2 diamino ethane tetraethanoic acid which more logically indicates that it is saturated.
Here is the corrected diagram
charco
not a silly question - I looked at the old name Ethylene Diamine Tetra Acetic acid and assumed that the structure was based on ethylene CH2=CH2
In fact as I now realise this is incorrect and there is no double bond!
The new name is 1,2 diamino ethane tetraethanoic acid which more logically indicates that it is saturated.
Here is the corrected diagram
In fact as I now realise this is incorrect and there is no double bond!
The new name is 1,2 diamino ethane tetraethanoic acid which more logically indicates that it is saturated.
Here is the corrected diagram
That's brillant
I can finally get it done Thanks!Related discussions
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