A recent investigation of the complexation of \( \mathrm{SCN}^{-} \...

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A recent investigation of the complexation of \( \mathrm{SCN}^{-} \)
P with \( \mathrm{Fe}^{3+} \) led to values of 125,20 and 1.0 for \( \mathrm{K}_{1}, \mathrm{~K}_{2} \)

W and \( \mathrm{K}_{3} \), respectively. What is the dissociation constant of \( \mathrm{Fe}(\mathrm{SCN})_{3} \) into its simplest ions on the basis of these data?
(1) \( 2.5 \times 10^{3} \)
(2) \( 4.0 \times 10^{-4} \)
(3) 1.0
(4) \( 8.0 \times 10^{-3} \)
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