Shriver & Atkins: Inorganic Chemistry 5e
Chapter 04
Iron(III) ion as an acid
Iron(III) ion acts as a Brønsted acid as is shown by the pH indicator paper.. The brownish color of the solution is characteristic of the hydroxy species as the hexaquairon( III) ion is pale purple.
[Fe(OH2)6]3+(aq) + H2O (l)
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Acidity of aqueous carbon dioxide
A lump of solid carbon dioxide is placed in water containing a few drops of universal indicator. The indicator changes colour to indicate an acid.
CO2(g) + H2O(l) 
H3O+(aq) + H3O-(aq)
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