Qualitative Analysis - Result Question 54
####57. Write the chemical reactions associated with the ‘brown ring test’.
$(2000,1 M)$
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Solution:
- $NaNO _3+H _2 SO _4 \longrightarrow NaHSO _4+HNO _3$
$2 HNO _3+6 FeSO _4+3 H _2 SO _4 \longrightarrow 3 Fe _2\left(SO _4\right) _3+2 NO+2 H _2 O$
$$ \begin{aligned} & FeSO _4+NO \longrightarrow \quad\left[Fe(NO) SO _4\right] \ & \text { Brown ring } \end{aligned} $$
$$ \text { (nitrosoferrous sulphate) } $$
