Pure aniline is a colorless liquid.
Understanding Aniline's Color Characteristics
While pure aniline is inherently clear and colorless, its appearance can change significantly upon exposure to the environment. This characteristic is crucial for anyone handling or observing aniline.
The Impact of Oxidation on Aniline's Color
Aniline is sensitive to air and undergoes a chemical reaction known as oxidation when exposed to it. This process alters the compound's structure, leading to a visible change in its color.
- Initial Change: Upon initial exposure and oxidation, pure aniline typically begins to turn yellow.
- Further Oxidation: With continued exposure and more extensive oxidation, the color deepens further, eventually becoming brown.
This means that while a freshly purified sample of aniline will be clear, samples that have been stored or exposed to air for some time may appear yellow or brown.
Summary of Aniline's Color States
The following table summarizes the color of aniline under different conditions:
| Aniline State | Color | Condition |
|---|---|---|
| Pure | Colorless | Unexposed to air; freshly distilled/purified |
| Oxidized | Yellow to Brown | Exposed to air; undergoing oxidation |
