91Ó°ÊÓ

The stepwise formation equations for the given complex ions are: a. Hexafluorocobaltate(III) ion \(\mathrm{CoF}_{6}^{3-}\) 1. \(\mathrm{[Co(H_{2}O)_6]^{3+} + F^{-} \rightarrow [CoF(H_{2}O)_5]^{2+} + H_{2}O}\) 2. \(\mathrm{[CoF(H_{2}O)_5]^{2+} + F^{-} \rightarrow [CoF_2(H_{2}O)_4]^{+} + H_{2}O}\) 3. \(\mathrm{[CoF_2(H_{2}O)_4]^{+} + F^{-} \rightarrow [CoF_3(H_{2}O)_3]^{0} + H_{2}O}\) 4. \(\mathrm{[CoF_3(H_{2}O)_3]^{0} + F^{-} \rightarrow [CoF_4(H_{2}O)_2]^{-} + H_{2}O}\) 5. \(\mathrm{[CoF_4(H_{2}O)_2]^{-} + F^{-} \rightarrow [CoF_5(H_{2}O)]^{2-} + H_{2}O}\) 6. \(\mathrm{[CoF_5(H_{2}O)]^{2-} + F^{-} \rightarrow [CoF_6]^{3-} + H_{2}O}\) b. Tetraamminezinc(II) ion \(\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{4}^{2+}\) 1. \(\mathrm{[Zn(H_{2}O)_6]^{2+} + NH_{3} \rightarrow [Zn(NH_{3})(H_{2}O)_5]^{2+} + H_{2}O}\) 2. \(\mathrm{[Zn(NH_{3})(H_{2}O)_5]^{2+} + NH_{3} \rightarrow [Zn(NH_{3})_2(H_{2}O)_4]^{2+} + H_{2}O}\) 3. \(\mathrm{[Zn(NH_{3})_2(H_{2}O)_4]^{2+} + NH_{3} \rightarrow [Zn(NH_{3})_3(H_{2}O)_3]^{2+} + H_{2}O}\) 4. \(\mathrm{[Zn(NH_{3})_3(H_{2}O)_3]^{2+} + NH_{3} \rightarrow [Zn(NH_{3})_4(H_{2}O)_2]^{2+} + H_{2}O}\)