The equilibrium constant values for the reaction of Ni 2 in aqueous solution with an amine to form the corresponding ammonia, en, and dien complexes increase in the order dien>en>ammonia. Why is this the case

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 answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).