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Resource Book for Sixth-Form Practical Chemistry

Experiment 8

Synthesis of an Azo Dye - The Coupling Reaction of Benzenediazonium Ion with Naphthalen-2-ol

image: Naphthalen-2-ol dissolved in aqueous sodium hydroxide solution Naphthalen-2-ol dissolved in 10% aqueous sodium hydroxide solution
image2: Naphthalen-2-ol dissolved in aqueous sodium hydroxide solution
image: The 4-hydroxybenzenediazonium ion solution The 4-hydroxybenzenediazonium ion solution
close-up image: The 4-hydroxybenzenediazonium ion solution
image: Adding the diazonium salt solution to the naphthalen-2-ol solution Adding the diazonium salt solution to the naphthalen-2-ol solution
image: The addition is completed. Brick red precipitate formed The addition is completed. Brick red precipitate formed
close-up image: The addition is completed. Brick red precipitate formed
image: Collecting the product (1-(4-hydroxyphenylazo)-2-naphthol Collecting the product (1-(4-hydroxyphenylazo)-2-naphthol
close-up image: the product (1-(4-hydroxyphenylazo)-2-naphthol
image: Dried product on a watch glass Dried product on a watch glass

2004 Department of Chemistry, The Chinese University of Hong Kong