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2. The stability constant reflects the strength of interaction between metal ions and ligands. When they are compared for the specific cases, the following expiation can be given:
a vs b: Trien has larger number of nitrogen atoms (3 compared to 2) and because nitrogen atoms are good electron donors these ligands form more stable complexes (more bonds) with metal ions, as reflected in pK value.
b vs c: Dien and Didsn have the same number of donating atoms (3 and 3) just in the case of Didsn one of the nitrogen atoms is changed with sulfur, especially in this case when the ligand has long chain, and this type of interactions is shown when pK values are compared.
a vs d: the same reasons apply here as for the first case, because the number of donating atoms is two times lower in En then in Trien.
a vs f: when another En is added the number of donating atoms is the same as in Trien, and this makes two pK values almost equal, but the complex with Trien is more stable because there is only one molecule of ligand and it is easier to form chelate then with two molecules that are quite large comparing to metal ion....

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