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Question:

Calculate the overall complex dissociation equilibrium constant for the [Cu(NH3)4]2+ ions, given that the stability constant (β4) for this complex is 2.1 × 10¹³

8.27 × 10⁻¹⁵

2.39 × 10⁻¹⁴

4.76 × 10⁻¹⁶

1.83 × 10⁻¹⁴

Solution:

Dissociation constant is the reciprocal of the stability constant (k = 1/β). Overall complex dissociation equilibrium constant, k = 1/β₄

Given that β₄ = 2.1 × 10¹³
k = 1/(2.1 × 10¹³)
k = 4.76 × 10⁻¹⁶