Coordination Complexes Part A [Fe(gly)2(H2O)2]+ [Mg(EDTA)]2? [Cu(NH3)4]2+ Na[Au(

Question

Coordination Complexes

Part A

[Fe(gly)2(H2O)2]+

[Mg(EDTA)]2?

[Cu(NH3)4]2+

Na[Au(Cl)2]

Enter the coordination numbers, in the order that the complexes are listed, as four integers separated by commas (e.g., 1,2,3,4).

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Part B

hexaaquairon(II), [Fe(H2O)6]?

tris(carbonato)cobaltate(III), [Co(CO3)3]?

diaquatetrabromovanadate(III), [V(H2O)2Br4]?

Express the charges numerically, in the order that the complexes are listed, separated by commas. For a nonzero charge, be sure to include the sign (e.g., +1,-2,+3).

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Part C

[NiCl2F2]2?

[Cr(H2O)4(NH3)2]3+

Na[Rh(CN)2]

Express the oxidation numbers numerically, in the order that the complexes are listed, separated by commas. For a nonzero oxidation number, be sure to include the sign (e.g., +1,-2,+3).

Coordination Complexes

A coordination complex is a species in which a central metal ion (or atom) is attached to a group of surrounding ions or molecules by coordinate covalent bonds. The surrounding species are called ligands. Within a ligand, the atoms that are directly attached to the metal ion (or atom) are called donor atoms. Most ligands contain a single donor atom (monodentate), but some contain two donor atoms (bidentate) or six donor atoms (hexadentate). The following table lists some examples. Ligand Number of
donor atoms Cl? 1 F? 1 Br? 1 CO32? 2 CN? 1 gly? 2 EDTA4? 6 NH3 1 H2O 1 CO 1 The coordination number for a complex is the total number of donor atoms surrounding the central atom. The overall charge on a complex is the sum of the charges of the metal and all the ligands.

Part A

What is the coordination number for each of the following complexes?

[Fe(gly)2(H2O)2]+

[Mg(EDTA)]2?

[Cu(NH3)4]2+

Na[Au(Cl)2]

Enter the coordination numbers, in the order that the complexes are listed, as four integers separated by commas (e.g., 1,2,3,4).

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Part B

What is the charge on each of the following complex ions?

hexaaquairon(II), [Fe(H2O)6]?

tris(carbonato)cobaltate(III), [Co(CO3)3]?

diaquatetrabromovanadate(III), [V(H2O)2Br4]?

Express the charges numerically, in the order that the complexes are listed, separated by commas. For a nonzero charge, be sure to include the sign (e.g., +1,-2,+3).

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Part C

What is the oxidation number of the central metal ion in each of the following complexes?

[NiCl2F2]2?

[Cr(H2O)4(NH3)2]3+

Na[Rh(CN)2]

Express the oxidation numbers numerically, in the order that the complexes are listed, separated by commas. For a nonzero oxidation number, be sure to include the sign (e.g., +1,-2,+3).

Explanation / Answer

Complex......................Coordination number
[Fe(gly)2(H2O)2]+ ............6

[Mg(EDTA)]2? ..................6

[Cu(NH3)4]2+....................4

Na[Au(Cl)2].....................2

PartB
[Fe(H2O)6]? .....................+2

tris(carbonato)cobaltate(III), [Co(CO3)3]? ......-3

diaquatetrabromovanadate(III), [V(H2O)2Br4]? ......-1

PartC

[NiCl2F2]2? .............. x+(-1)*2+(-1)*2 = -2 ==> x = +2

[Cr(H2O)4(NH3)2]3+ ..........x+0+0 = +3 ==> x = +3

Na[Rh(CN)2].................+1 + X +(-1)*2 = 0 ==> x = +1

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