The identification and differentiation of Fe2+ (ferrous) and Fe3+ (ferric) ions are essential in chemistry. These tests are commonly encountered in the JAMB Chemistry exam. In this note, we will discuss the tests that can be conducted to distinguish between Fe2+ and Fe3+ ions based on their chemical properties.
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In summary, the tests described above can be used to differentiate between Fe2+ and Fe3+ ions. The reaction with sodium hydroxide (NaOH) produces a green precipitate for Fe2+ and a reddish-brown precipitate for Fe3+. The reaction with potassium thiocyanate (KSCN) results in no immediate color change for Fe2+, while a deep red color is observed for Fe3+. Lastly, the reaction with hydrogen peroxide (H2O2) causes effervescence and a color change to brown for Fe2+, whereas Fe3+ shows no significant change. These tests provide a reliable means of identifying the presence of Fe2+ and Fe3+ ions in a given solution.
Note: It is always advisable to confirm these test results by conducting multiple tests and comparing the observations with known standards or using additional confirmatory tests to ensure accurate identification.
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