What is meant by the term stability constant (Kstab)?
The stability constant (Kstab) represents the equilibrium constant for the formation of a complex ion in a solvent from its constituent ions or molecules.
An example of this equilibrium is: [Cu(H2O)6]2+ + 4Cl-(aq) ⇌ [CuCl4]2-(aq) + 6H2O(l).
Answer in your head, out loud, or on paper, then tap the card to flip.
What is the general expression for Kstab of [ML6]3+(aq), where M = a transition metal ion and L = a neutral monodentate ligand?
Answer in your head, out loud, or on paper, then tap the card to flip.
Why does H2O not appear in the expression for Kstab?
H2O is in such a large excess that its concentration is regarded as constant.
Answer in your head, out loud, or on paper, then tap the card to flip.
What are the units of Kstab?
The units for Kstab depend on the specific reaction but often have units such as mol-3 dm9 or mol-4 dm12, depending on the number of ligands being exchanged.
Answer in your head, out loud, or on paper, then tap the card to flip.
Why are Kstab values often quoted on a log10 scale?
Quoting Kstab values on a log10 scale simplifies the comparison of stability constants between different complexes.
Answer in your head, out loud, or on paper, then tap the card to flip.
What is the relationship between the Kstab value of a complex ion and its stability?
The higher the Kstab value, the more stable the complex ion.
Conversely, the lower the Kstab value, the less stable the complex ion.
Answer in your head, out loud, or on paper, then tap the card to flip.