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