The Brown Ring Test is a chemical test used to detect the presence of nitrate ions (NO3-) in a solution. In this test, a solution containing nitrate is mixed with iron(II) sulfate (FeSO4) and then carefully layered with concentrated sulfuric acid (H2SO4). If nitrates are present, a brown ring forms at the interface of the two layers. This ring forms due to the formation of nitroso iron (II) complex, indicating a positive result. It's a simple and effective test commonly used in labs for identifying nitrates in chemical samples, as it provides quick and clear visual confirmation.

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