Coordination Complexes - Video Tutorials & Practice Problems
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1
concept
Coordination Complexes I and II
Video duration:
2m
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Coordination complexes are ionic compounds composed of a complex ion connected to what we call a counter ion to maintain neutrality. Now recall that an ionic compound is written as cation first anion second. In our coordination complex 1, which we have here, the complex ion equals a cation and is written first. So if we take a look here at this structure, how do we spot the portion that is the complex ion? Remember, key giveaway is that complex ions are always written in brackets. So this portion in brackets represents our complex ion. It is just a portion of the coordination complex overall. So if that's the complex ion, what does the c l represent? Well, the CL here represents our counter ion. CL is in group 7 a, so it's minus 1. Again, it is our counter ion. And we're gonna say here, where did this 3 originate? Well, it came from the complex ion. So basically uncrisscrossed the charges, so our comp our complex ion was in brackets, n I n h three four. It is a cation here since it's written first, so it was 3 plus. So this is our complex ion. Now over here on the other side, we have what? We have our complex ion 2. In the complex ion 2, the complex ion is the anion, and it's written second. It is the portion again that's in brackets. Here, lithium represents our counter ion. Lithium's a group 1 a, so it's plus 1. And then this 2, it originates from the complex ion. The complex ion is an anion here, so that 2 was part of 2 minus. So this would be our complex ion. So just remember, the entire structure itself, for both, those are our coordination complexes. The coordination complex is composed of its complex ion, which has a charge, and then the counter ion, which has an opposing charge. Overall, combining these 2 gives us a neutral ionic compound, otherwise known as our coordination complex.
2
example
Coordination Complexes Example
Video duration:
43s
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Here it says determine the formula for the coordination complex created between here we have our complex ion, and this is our counter ion. In order to combine them, they treat them just like 2 ions, which they are. The numbers in the charges are different, so when they're different they don't cancel out, they crisscross. 2 would come here, and 1 would come here. So when we write this out, here is our complex ion. Since it's a cation, it has to be written first. And then the fluorine, which is the anion, is written second. The 2 from the charge of the complex ion came down here, so this will represent the formula for our coordination complex.
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Problem
Problem
Correctly label all the components of the coordination complex: [Mn(NH3)4Cl2]Br.
A
Mn is the metal cation, NH3 and Br are the ligands, and Cl is the counterion.
B
Mn is the metal anion, Cl and Br are the ligands, and NH3 is the counterion.
C
Mn is the metal cation, NH3 and Cl are the ligands, and Br is the counterion.
D
Mn is the metal atom, NH3 and Cl are the ligands, and Br is the counterion.
E
Mn is the metal atom, NH3 and Br are the ligands, and Cl is the counterion.
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Problem
Problem
Which of the following statements is/are true about the coordination complex of: Na2[SnCl6].
I) The coordination complex contains 8 ligands. II) The metal cation of the complex ion has an overall charge of +6. III) The sodium ion represents the counterion. IV) The complex ion has an overall charge of –2.
A
I only
B
II and III
C
I, III, and IV
D
III and IV
E
IV only
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