Stability Constants, kstab multiple choice questions

Stability Constants, Kstab

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What is the expression for the stability constant for the following equilibrium?

[PtCl₄]^2-_(aq) + 2NH_3(aq) ⇌ Pt(NH₃)₂Cl_2(aq) + 2Cl^-_(aq)

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Two complexes A and B have stability constants of 2.0 x 10^11^ and 5.7 x 10^13^ respectively.

Which complex will be more stable?

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3 of 5

Sodium hydroxide solution is added to a nickel(II) sulfate solution. A series of ligand exchange reactions occurs. The second step is:

[Ni(H₂O)₅(OH)]⁺_(aq) + OH^-_(aq) ⇌ Ni(H₂O)₄(OH)_2(s) + H₂O _(l)

At equilibrium, the mixture contains 0.60 mol dm^-3 Ni(H₂O)₄(OH)₂, 0.30 mol dm^-3 [Ni(H₂O)₅(OH)]⁺, and 0.10 mol dm^-3 NaOH.

Calculate the stability constant K_stab for this step.

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4 of 5

Ethylenediamine (en) is added to a solution containing cobalt(II) ions, forming [Co(en)₂]³⁺ through a series of ligand exchange reactions. The first step is:

Co²⁺_(aq) + en_(aq) ⇌ [Co(en)]²⁺_(aq)

When a 1.50 mol dm^-3 solution of cobalt(II) ions is mixed with a 1.50 mol dm^-3 solution of ethylenediamine, the equilibrium concentration of the [Co(en)]²⁺ complex is 1.45 mol dm^-3.

Calculate the stability constant K_stab for this step.

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5 of 5

What are the units for K_stab in the equation below?

$K_{s t a b} = \frac{{[C r {(H_{2} O)}_{4} C l_{2}]}^{+}}{[{[C r {(H_{2} O)}_{6}]}^{3 +}] {[C l^{-}]}^{2}}$

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