Interaction | Reaction | Process     Data Page

When excess dilute ammonia is added to a solution of green hexaaquairon(II) ion, the complex cation acts as a Brønsted acid and loses two protons giving a precipitate of green tetraaquadihydroxyiron(II) and two ammonium ions. (Only two moles of ammonia are used.)

On standing in air the green ppt. turns brown.

[Fe(H2O)6]2+
  +  
2
NH3(aq)
         

Fe(H2O)4(OH)2
Fe(OH)2
  +  
2
[NH4]+
Reactant Page Go To Go To
Hexaaquairon(II) ion     Reactions Using    Reactions Forming
Ammonia, aqueous     Reactions Using    Reactions Forming
Tetraaquadihydroxyiron(II)     Reactions Using    Reactions Forming
Ammonium ion     Reactions Using    Reactions Forming
     Reactions Using    Reactions Forming

Interaction, Reaction, Process defined as:
British A-Level Chemistry: A2
Precipitation
Proton transfer: Brønsted reaction

© Mark R. Leach 1999 –

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