\( \mathrm{Fe}(\mathrm{OH})_{2} \) is diacidic base has \( K_{b_{1}}=10^{-4} \) and \( K_{b_{2}}...

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\( \mathrm{Fe}(\mathrm{OH})_{2} \) is diacidic base has \( K_{b_{1}}=10^{-4} \) and \( K_{b_{2}}=2.5 \times 10^{-6} \)
What is the concentration of \( \mathrm{Fe}(\mathrm{OH})_{2} \) in \( 0.1 \mathrm{M} \mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{2} \) solution?
(a) \( 4 \times 10^{-9} \)
(b) \( 2.5 \times 10^{-6} \)
(c) \( 10^{-10} \)
(d) \( 10^{-14} \)
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