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Chapter 46 Dyes and Dyeing Diazotization of Sulfanilic Acid & Preparation of Methyl Orange

Chapter 46 Dyes and Dyeing Diazotization of Sulfanilic Acid & Preparation of Methyl Orange. Purpose. In this experiment a separately prepared diazonium salt is coupled with N,N -dimethylaniline in a weakly acidic solution to give Methyl Orange.

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Chapter 46 Dyes and Dyeing Diazotization of Sulfanilic Acid & Preparation of Methyl Orange

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  1. Chapter 46 Dyes and Dyeing Diazotization of Sulfanilic Acid & Preparation of Methyl Orange

  2. Purpose • In this experiment a separately prepared diazonium salt is coupled with N,N-dimethylaniline in a weakly acidic solution to give Methyl Orange. • The product is isolated by filtration and dried between two pieces of filter paper.

  3. Comments • Follow pp. 635-636, 639-640(microscale). • Follow the lab handout for all experimental procedures. Wearing rubber gloves is necessary during this lab. You will work with toxic and corrosive compounds. • Calculate yield. Moderate to good yields should be achieved. (Moles Product / Moles Starting Material) x 100 = % Yield

  4. Safety • Sulfanilic acid is irritating to eyes, respiratory system and skin. May cause sensitization by skin contact. Do not swallow, do not inhale and avoid contact with eyes and skin. Wear gloves and handle with caution. • N,N-Dimethylaniline is toxic by inhalation, in contact with skin and if swallowed. Limited evidence of carcinogenic effects. Do not swallow, do not inhale and avoid contact with eyes and skin. Wear protective gloves and goggles. • HCl is corrosive, wear gloves and use caution.

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