Coordination CompoundHard
Question
For the reaction, Ni2+ + 4NH3 ⇋ [Ni(NH3)4]2+ at equilibrium, if the solution contains 1.6 ×10-4% of nickel in the free state, and the concentration of NH3 at equilibrium is 0.5 M. Then the instability constant of the complex will be approximately equal to :
Options
A.1.0 × 10-5
B.1.5 × 10-16
C.1.0 × 10-7
D.1.5 × 10-17
Solution
Ni2+ + 4 NH3 ⇋ [Ni(NH3)4]2+
∴ k =
But
= 1.6 × 10-6 or 
≈ 1.6 × 10-6
∴ k =
= 107
Hence instability constant = 10-7
∴ k =
But
= 1.6 × 10-6 or ≈ 1.6 × 10-6 ∴ k =
= 107 Hence instability constant = 10-7
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