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Indigo Synthesis - Indigo Synthesis Report Author...

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Indigo Synthesis Report Author: Spencer Stewart Supervisor: Xiaoyan Tu Sponsoring Organization: Chemistry 104B Section 101 Date Experiment was Performed: 03 April 2008 10 April 2008 Date Report was Submitted: 17 April 2008 Abstract The percent yield of Indigo was 53.7% from the reaction between 2 Nitro-Benzaldehyde and Acetone. The percent yield of Indigo Carmine was 914% from the reaction of Indigo and concentrated Sulfuric acid. The yield of Indigo Carmine was determined by comparing the results of absorption spectroscopy data achieved for the Indigo Carmine solution and a series of standards.
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Introduction The objective of this experiment was to have students synthesize Indigo, make Leucoindigo from Indigo, perform a sulfonation reaction, dye a clothe swatch using vat dying, and use absorption spectroscopy to determine the yield of the Indigo synthesized. The Indigo was synthesized through a reaction between 2 Nitro-Benzaldehyde and Acetone in the presence of a particularly strong base, in this case, concentrated NaOH. When the reaction is complete the Indigo product is separated from the solution through precipitation. This precipitate was then vacuum filtered and allowed to dry before massing the product. Next, the Indigo was mixed with NaOH and Sodium Stannite to make Leucoindigo. This Leucoindigo solution was gravity filtered and the
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