Interaction | Reaction | Process Data Page
When excess hydroxide is added to a solution of pink hexaaquacobalt(II) ion, the complex cation acts as a Brønsted acid and loses two protons giving a precipitate of blue tetraaquadihydroxycobalt(II) and two waters. (Only two moles of hydroxide are used.)On standing in air the blue ppt. turns pink and then brown.
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