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13 Dec 2019

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

[Co(NH3)4Cl2]+

[Pb(EDTA)]2?

[Cu(NH3)4]2+

[Ag(NH3)2]NO3

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

hexaaquachromium(II), [Cr(H2O)6]?

tris(carbonato)ferrate(III), [Fe(CO3)3]?

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

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

[NiCl2Br2]2?

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

Na[Rh(CN)2]

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Trinidad Tremblay
Trinidad TremblayLv2
17 Dec 2019

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Related questions

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

hexaaquachromium(II), [Cr(H2O)6]?

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

amminepentachloroplatinate(IV), [Pt(NH3)Cl5]?

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

[NiCl2F2]2?

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

Na[Cu(CN)2]

A complex ion is a species in which a central metal ion 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), six donor atoms (hexadentate), or another combination of donor atoms. A complex ion that is associated with one or more counter ions is called a coordination compound. For example [PdCl4]2− is a complex ion, and Na[PdCl4] is a coordination compound. The following table lists some common ligands.

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 or compounds?

a) [Co(NH3)4Cl2]+

b) [Pb(EDTA)]2−

c) [Pt(NH3)4]2+

d) [Ag(NH3)2]NO3

Part B

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

a) hexaaquachromium(II), [Cr(H2O)6]?

b) tris(carbonato)aluminate(III), [Al(CO3)3]?

c) amminepentachloroplatinate(IV), [Pt(NH3)Cl5]?

Part C

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

a) [NiCl2Br2]2−

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

c) Na[Ag(CN)2]

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

[NiCl2Br2]2?

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

Na[Rh(CN)2]

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

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