2. Tricolor cup phenomenon in college chemistry experiment.

3, chemical trichromatic cup experiment report.

4. Experimental color of tricolor cup.

1. Principle: Halogen is extracted by organic solvent in solution.

2. Step: Add isoamyl alcohol, water and carbon tetrachloride into the test tube respectively, immerse the glass rod into the mixture of potassium chloride and insert it into the bottom, and observe the color change of the three-layer solution after stirring.

3. Phenomenon: The first three layers are colorless oil, colorless transparent oil and colorless oil from top to bottom, namely isoamyl alcohol, water and carbon tetrachloride.

4. After insertion, iodine is dissolved in it, and the color changes from top to bottom to orange red, light yellow and purple red.