THIN LAYER CHROMATOGRAPHY
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Adequate student prep of acetylsalicylic acid 1A. negative control, FeCl3 only. 1B. pure salicylic acid. 1C. student prep of aspirin. 1D. commercial aspirin, past expiration date. CURTSEY OF : Mr. Hull and Mr. Temponi.
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Poor student prep of acetylsalicylic acid 2A. negative control, FeCl3 only. 2B. pure salicylic acid. 2C. student prep of aspirin 2D. commercial aspirin, past expiration date. 2E. commercial aspirin, not expired,
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| 1A 1B 1C 1D | 2A 2B 2C 2D 2E |
Why does the solution turn purple when a salicylic acid is present? (hint) The iron(III) ion can complex six phenolate ions. This complex reflects visible light with wavelengths between 0.40 μm and 0.45 μm.