The formation constant (kf) of a complex depends on several factors, and it can also communicate information about the complex. which of the following statements about the formation constant are true?
select all that apply
the complex [ni(en)3]2+ is more stable than the complexes [ni(nh3)6]2+ and [ni(h2o)6]2+.
the value of the formation constant always increases as the number of ligands increases.
steric hindrance of ligands will generally reduce the value of the formation constant.
the coordination number of the central metal ion is related to the formation constant of the complex.
complexes formed with v2+ are more stable than complexes formed with v5+.
part b)
for the complex formation reaction where m is any metal and l is any ligand,
m++2l? [ml2]+
kf is the formation constant for the complex at equilibrium and ? g? is the gibbs free energy change for the reaction at equilibrium. the formation constant (kf) can be related to the gibbs free energy change (? g? ) for a reaction by the equation
? g? =? rtln kf
where t is the temperature in kelvins and r is the gas constant equal to 8.314 j? k? 1? mol? 1. the complex formation is generally a spontaneous process; thus, the gibbs free energy change is negative.
calculate the formation constant for the formation of [ni(nh3)2(h2o)4]2+ from [ni(h2o)6]2+, given that ? g? is ? 29.0kj? mol? 1 at 298 k. kf=?
part c)
in calculating the concentration of [cu(nh3)4]2+ from [cu(h2o)4]2+, the stepwise formation constants are as follows:
k1=1.90�104
k2=3.90�103
k3=1.00�103
k4=1.50�102
calculate the overall formation constant (kf) for the formation of [cu(nh3)4]2+from [cu(h2o)4]2+. kf=?