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Most M-O-M bonds are angular but some are linear, namely, that in[(NH3)5Cr-OCr( NH3)5]4+. Why?

Think it has to do with the bridging of the Oxygen atom, but notsure.

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Related questions

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]

You observe: 3 mL of 0.10 M Pb(NO3)2 added to 4 Ml of 5 M NH3 (aq) -----> white solid.


You believe that OH- ions in the NH3 (aq) are causing the change. Your teammate plans to conduct the test below to determine if OH- in the 5 M concentration of NaOH is incorrect. Why?


Test: 3 mL of 0.10 M Pb(NO3)2 are added to 4 mL of 5 M NaOH ------> ??

1. NH3(aq) + H2O(l) ó NH4+(aq) + OH–(aq)

In aqueous solution, ammonia reacts as represented above. In 0.0180 M NH3(aq) at 25ºC, the hydroxide ion con­centration, [OH–] is 5.60 x 10–4 M. In answer­ing the following, assume that temperature is constant at 25ºC and that volumes are additive.

(a) Write the equilibrium-constant expression for the re­action represented above.

(b) Determine the pH of 0.0180 M NH3(aq).

(c) Determine the value of the base ionization constant, Kb, of NH3(aq).

(d) Determine the percent ionization of NH3 in 0.0180 M NH3(aq).

(e) In an experiment, a 20.0 mL sample of 0.0180 M NH3(aq) was placed in a flask and titrated to the equivalence point and beyond using 0.0120 M HCl (aq).

(i) Determine the volume of 0.0120 M HCl (aq) that was added to reach the equivalence point.

(ii) Determine the pH of the solution in the flask after a total of 15.0 mL of 0.0120 M HCl (aq) was added.

(iii) Determine the pH of the solution in the flask after a total of 40.0 mL of 0.0120 M HCl (aq) was added

Thank you in advance, sorry this is a little longer question. Please help me with the work on how to do them.

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