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.
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