Solution of task 319 of Chemistry Book Shimanovich 2003

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319. What are the complex compounds called double salts? Write the dissociation equations for K4 [Fe (CN) 6] and (NH4) 2Fe (SO4) 2 salts in an aqueous solution.
In what case does precipitation of iron (II) hydroxide precipitate, if alkaline solution is added to each of them? Write the molecular and ion-molecular equation of the reaction.

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