Answer:
This is due to stability constant
Explanation:
A stability constant (formation constant, binding constant) is an equilibrium constant for the formation of a complex in solution. It is a measure of the strength of the interaction between the reagents that come together to form the complex.
Factors affecting the stability of complexes
4.1 Nature of central metal ion. ...
4.2 Ionic size. ...
4.3 Ionic charge. ...
4.4 Electronegativity. ...
4.5 Temperature and pressure. ...
4.6 Ligand nature. ...
4.7 Size and charge. ...
4.8 Basic character.
The value of the equilibrium constant also increases.
Since
Ni(H2O)6^2+ + 6NH3 -----> Ni(NH3)6^2+ + 6H2O
Ni(H2O)6^2+ + 3en -------> Ni(en)3 ^2+ + 6H2O
Ni(H2O)6^2+ + 2dien ------> Ni(dien)2^2+ + 6H2O
Here Difference in the power of the amine used arise since ammonia is a monodentate ligand, en is bidentate ligand and dien should be a tridentate ligand.
Thus both dien and en will create a ring with the metal ion.
This type of closed ring formation provides additional stability to the metal complex and is called a chelate effect. Because of the high stability of the product, the value of the equilibrium constant also rises.
Learn more about ammonia here: https://brainly.com/question/14672082?referrer=searchResults
