Qualitative Analysis - Result Question 63
####66. The acidic aqueous solution of ferrous ion forms a brown complex in the presence of $NO _3^{-}$, by the following two steps :
$$ \begin{gathered} {\left[Fe\left(H _2 O\right) _6\right]^{2+}+NO _3^{-}+H^{+} \longrightarrow \ldots+\left[Fe\left(H _2 O\right) _6\right]^{3+}} \\ {\left[Fe\left(H _2 O\right) _6\right]^{2+}+\ldots \longrightarrow \ldots \ldots+H _2 O} \end{gathered} $$
Complete and balance the equation.
(1993, 2M)
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Solution:
- $3\left[Fe\left(H _2 O\right) _6\right]^{2+}+NO _3^{-}+4 H^{+} \longrightarrow NO+3\left[Fe\left(H _2 O\right) _6\right]^{3+}$
$\left[Fe\left(H _2 O\right) _6\right]^{2+}+NO \longrightarrow\left[Fe\left(H _2 O\right) _5 NO\right]^{2+}+H _2 O$
$+2 H _2 O$
