Stability Constants and Stereoisomerism

Question 1

The stability constant Kstab is:

• AThe equilibrium constant for the formation of a complex ion
• BThe rate constant for the decomposition of a complex
• CThe solubility product
• DThe acid dissociation constant

Question 2

Why is [H2O] omitted from the Kstab expression?

• AWater is a gas
• BWater is the solvent and its concentration is effectively constant
• CWater does not take part in the reaction
• DWater is a product

Question 3

Which is the Kstab expression for [Cu(H2O)6]2+ + 4NH3 ⇌ [Cu(NH3)4(H2O)2]2+ + 4H2O?

• A[Cu(NH3)4(H2O)2]2+ / [NH3]^4
• B[Cu(H2O)6]2+[NH3]^4 / [Cu(NH3)4(H2O)2]2+
• C[Cu(NH3)4(H2O)2]2+ / ([Cu(H2O)6]2+[NH3]^4)
• D[Cu(NH3)4(H2O)2]2+[H2O]^4 / ([Cu(H2O)6]2+[NH3]^4)

Question 4

A higher log10 Kstab means the complex is:

• ALess stable and easily decomposed
• BInsoluble
• CColourless
• DMore stable with the equilibrium lying far to the right

Question 5

A low log10 Kstab shows that:

• AThe complex is less stable and its ligands are easily displaced
• BThe complex is extremely stable
• CThe complex is neutral
• DThe metal is a non-metal