Interaction | Reaction | Process Data Page
When carbonate ion (from sodium carbonate, for example) is added to a ruby-red solution of hexaaquachromium(III) ion, the complex cation acts as a Brønsted acid and loses three protons giving a green precipitate of the neutral complex triaaquatrihydroxychromium(III), and three protons.The carbonate ion is protonated to carbonic acid which is unstable and decomposes to carbon dioxide - with effervescence - and water.
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