The acidic, aqueous solution of ferrous ion forms a brown complex in the presence of
NO−3 by the following two steps. Complete and balance the equations:
[Fe(H2O)6]2++NO−3+H+⟶(a)+Fe(H2O)6]3++H2O
[Fe(H2O)6]2++(b)⟶(c)+H2O
The product c is [Fe(H2O)5NO]2+
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