Question

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

[Co(NH3)4Cl2]+

[Mg(EDTA)]2?

[Zn(H2O)4]2+

Na[Au(CN)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).

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

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

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

amminepentabromoplatinate(IV), [Pt(NH3)Br5]?

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).

3. 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[Ir(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).

Answer 1

Part 1) What is the coordination nr for the following complexes

i) [Co(NH₃)₄Cl₂]⁺

Answer: 6

Explanation . Here, ligands are monodentate

[Mg(EDTA)]^2-

Answer: 6

ii) EDTA is a hexadentate ligand

[Zn(H₂O)₄]²⁺

Answer: 4

Water is a monodentate ligand

iii) Na[Au(CN)₂]

Answer: 2

CN is a monodentate ligand

Answer (6,6,4,2)

Part2)

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

i) hexaaquachromium(II), [Cr(H₂O)₆]?

Answer: +2

Explanation

H2O is a neutral ligand

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

Answer:-3

Explanation

Here, charge on the ligand is -2

iii) amminepentabromoplatinate(IV), [Pt(NH₃)Br₅]?

Answer: -1

Charge on Pt = +4, Charge of NH₃ = 0, Br5 = -5 Therefore, charge on the complex = -1 charge of complex = -5 + 4 = -1

Answer (+2 , -3 , -1)

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

i) [NiCl₂F₂]^2-

m -4 = -2

m = +2

ii) [Fe(H₂O)₂(NH₃)₄]³⁺

m = +3

iii) Na[Ir(CN)₂]

m -2 = +1

m = 1-2 =-1

Answer (+2, +3, -1)