Interaction | Reaction | Process     Data Page

When excess dilute hydroxide is added to a solution of green hexaaquairon(II) ion, a precipitate of green tetraaquadihydroxyiron(II), a neutral complex is formed. (Only two moles of hydroxide are utilised.)

On standing in air the green ppt. turns brown.

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

Fe(H2O)4(OH)2
Fe(OH)2
  +  
2
Na+
  +  
2
H2O
  +  
4
NaOH(aq)
Reactant Page Go To Go To
Hexaaquairon(II) ion     Reactions Using    Reactions Forming
Sodium hydroxide solution     Reactions Using    Reactions Forming
Tetraaquadihydroxyiron(II)     Reactions Using    Reactions Forming
Sodium ion     Reactions Using    Reactions Forming
Water     Reactions Using    Reactions Forming
Sodium hydroxide solution     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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