The dissociation constants (Kd) of two complexes (A) and (B) are given below (a) K4[Fe(CN)6] ; K

step 1 In this problem we have given that the dissociation constants KD of two complexes A and B are gi

The dissociation constants (Kd) of two complexes (A) and (B)...

The dissociation constants $\left(\mathrm{K}_{\mathrm{d}}\right)$ of two complexes (A) and (B) are given below (a) $\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right] ; \mathrm{K}_{\mathrm{d}}=2.6 \times 10^{37}$ (b) $\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right] ; \mathrm{K}_{\mathrm{d}}=1.9 \times 10^{17}$ (a) A and B are equally stable. (b) A is more stable than B . (c) B is more stable than A . (d) The data is insufficient.

The dissociation constants $\left(\mathrm{K}_{\mathrm{d}}\right)$ of two complexes (A) and (B) are given below
(a) $\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right] ; \mathrm{K}_{\mathrm{d}}=2.6 \times 10^{37}$
(b) $\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right] ; \mathrm{K}_{\mathrm{d}}=1.9 \times 10^{17}$
(a) A and B are equally stable.
(b) A is more stable than B .
(c) B is more stable than A .
(d) The data is insufficient.

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Key Concepts

Relationship Between Equilibrium Constants and Stability

In the context of complex formation and dissociation, there is an inverse relationship between the dissociation constant and the overall stability of the complex. This means that when the dissociation constant is lower, the equilibrium lies more towards the formation of the intact complex, indicating higher stability. Conversely, a high dissociation constant points to a system that favors dissociation and, therefore, exhibits lower thermodynamic stability.

Complex Stability

Complex stability in coordination chemistry reflects how strongly the ligands bind to the central metal ion. A stable complex is less likely to undergo dissociation or ligand replacement reactions. The stability can be assessed by comparing dissociation constants, where a lower value corresponds to a more stable complex.

Dissociation Constant

The dissociation constant (K?d?) quantifies the extent to which a complex dissociates into its individual components in solution. A higher dissociation constant indicates a greater tendency for the complex to break apart, whereas a lower K?d? suggests that the complex remains predominantly intact, signifying greater stability.

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