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AIIMS 2017
Exam
AIIMS
Year
2017
Subject
Chemistry
Chapter
Ionic Equilibrium

AIIMS 2017 · Chemistry · Ionic Equilibrium

Calculate the overall complex dissociation equilibrium constant for...

Calculate the overall complex dissociation equilibrium constant for the [Cu(NH3)4]2+\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]^{2+} ions, given that stability constant \left(\beta_4\right)forthiscomplexisfor this complex is2.1 \times 10^{13}.

Options

  1. A8.27×10−138.27 \times 10^{-13}
  2. B4.76×10−144.76 \times 10^{-14}
  3. C2.39×10−72.39 \times 10^{-7}
  4. D1.83×10141.83 \times 10^{14}

Correct answer

B. 4.76×10−144.76 \times 10^{-14}

Step-by-step solution

Dissociation constant is the reciprocal of the stability constant (β=1/K)(\beta=1 / K). Overall complex dissociation equilibrium constant, K=1β4=12.1×1013=4.76×10−14\begin{aligned} K & =\frac{1}{\beta_4} \\ & =\frac{1}{2.1 \times 10^{13}}=4.76 \times 10^{-14}\end{aligned}
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