The brown ring test for NO_2^- and NO_3^- is | vedclass

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Question

(C) The brown ring test is a common laboratory test used to detect the presence of nitrate ions $(NO_3^-)$ or nitrite ions $(NO_2^-)$ in a solution.Wh

Vedclass · Accepted Answer

$[Fe(H_2O)_5(NO)]^{2+}$

Vedclass · Answer

(C) The brown ring test is a common laboratory test used to detect the presence of nitrate ions $(NO_3^-)$ or nitrite ions $(NO_2^-)$ in a solution.When a freshly prepared ferrous sulfate $(FeSO_4)$ solution is added to the nitrate solution,followed by the careful addition of concentrated sulfuric acid $(H_2SO_4)$ along the sides of the test tube,a brown ring is formed at the junction of the two layers.This brown ring is due to the formation of the complex ion $[Fe(H_2O)_5(NO)]^{2+}$,which is known as pentaaquanitrosyliron$(II)$ ion.

The brown ring test for $NO_2^-$ and $NO_3^-$ is due to the formation of a complex ion with the formula:

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