Nitrite Ion Test Suite

The simulation models classic qualitative tests used to detect the nitrite ion (NO2‑) in aqueous solutions. Reagents such as dilute sulfuric acid, starch‑iodide paper, and potassium permanganate generate characteristic colour changes, brown fumes, and gas evolution that distinguish nitrite from nitrate and other nitrogen species.

Students can observe each reaction step, from the formation of nitrous acid to its disproportionation, the brown‑ring test at the liquid interface, and the reduction of permanganate. By comparing the visual outcomes of different reagents, learners see how redox chemistry and acid‑base behavior are exploited in analytical chemistry.

The activity reinforces concepts of oxidation‑reduction, gas evolution, colour indicators, and the practical interpretation of laboratory tests, supporting high‑school chemistry curricula.