4. Describe the analytical properties and formulate the reaction equations for the formation and destruction of the following complex compounds: (NH4)3[FeF6]; [Co(NH3)6]SO4. Name the salts [Zn(NH3)4](OH)2 and K4[Fe(CN)6]; give examples of reactions of formation and destruction of these compounds. Write an expression for the stability constants and write out their values.

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