Brown Ring Test Simulator

Brown Ring Test

Confirmatory Test for Nitrate (NO₃⁻) Ions in Qualitative Analysis.

1. Setup Experiment

Select Unknown Salt Solution

Sodium Nitrate (NO₃⁻) Solution Sodium Chloride (Cl⁻) Solution [Control]

0

1

2

2. Observation

Liquid Interface Clear Aqueous

Status: Standby.
Start by selecting an aqueous salt solution. In Step 1, freshly prepared Iron(II) Sulfate (FeSO₄) will be added to the mixture.

3. Chemical Principles

Reduction: Fe²⁺ reduces the Nitrate (NO₃⁻) ion to Nitric Oxide (NO) gas.

NO₃⁻ + 3Fe²⁺ + 4H⁺ → NO + 3Fe³⁺ + 2H₂O

Coordination: The NO immediately binds with remaining hydrated Fe²⁺ to form the Pentaaquanitrosoiron(II) complex, which appears as a brown ring at the acid-water junction.

[Fe(H₂O)₆]²⁺ + NO → [Fe(H₂O)₅(NO)]²⁺ + H₂O

Visual Key

Aqueous Solution

Dense Conc. H₂SO₄ Layer

Nitrosoferrous Complex (Ring)

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