Experiment 12B submit.txt - Experiment 12B Synthesis of a Dye Methyl Orange Experiment 12B consists of synthesizing a synthetic dye through azo coupling

Experiment 12B submit.txt - Experiment 12B Synthesis of a...

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Experiment 12B: Synthesis of a Dye, Methyl Orange Experiment 12B consists of synthesizing a synthetic dye through azo coupling and electrophilic aromatic substitution. All azo dyes use the same general reaction, azo coupling, which occurs between a diazonium salt and an activated aromatic substrate, where the diazonium ion will be the electrophile.1 After having created the dye, it will be tested on its color qualities by also testing its pH indicator, because at different pH s will produce distinct color variances. The formation of Diazonium Salt was the first mechanical step in creating the synthetic dye of methyl orange. In a small Erlenmeyer flask ~0.06(0.0599)g sodium carbonate was dissolved in H2O, then ~0.2(0.2029)g of sulfanilic acid monohydrate was added. This solution will be heated to reflux until the mixture is homogenous. Following the step of creating the diazonium ion, ~0.08(0.0802)g of sodium nitrile was added and stirred once again to a homogenous state. This initial step was an acid base reaction. Sulfanilic acid monohydrate is unable to dissolve completely on its own, which was why sodium carbonate was introduced to help dissolve sulfanilic acid. This process will then go to create the diazonium ion, which was why it was important for the reaction to be homogenous, to increase the product yield. The more the solution becomes homogenous, meaning all the reagents have dissolved into one another, would contribute to a greater and purified yield. The solution was then placed in an ice water bath for about
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