Ionic EquilibriumMedium
Question
A recent investigation of the complexation of SCN– with Fe3+ led to values of 125, 20 and 1.0 for K1, K2 and K3, respectively. What is the dissociation constant of Fe(SCN)3 into its simplest ions on the basis of these data?
Options
A.2.5 × 103
B.4.0 × 10–4
C.1.0
D.8.0 × 10–3
Solution
$K_{\text{formation}} = K_{1}.K_{2}.K_{3} = 125 \times 20 \times 1 = 2500$
$\therefore K_{\text{dissociation}} = \frac{1}{K_{\text{formation}}} = 4 \times 10^{- 4}$
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