Experiment 9 - CHM146L Organic Chemistry 2 Laboratory 1st...

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CHM146L Organic Chemistry 2 Laboratory 1st Quarter SY 2009-2010 Methyl Orange Martin, Marilen M. 1 , De Guzman, Regina 2 1 Professor, School of Chemical Engineering, Chemistry and Biotechnology, Mapua Institute of Technology; 2 Student, CHM146L /B11, School of Chemical Engineering, Chemistry and Biotechnology, Mapua Institute of Technology ABSTRACT Dyes are used to give colors to substances, especially fabrics. Chromophores are functional groups found in dyes that absorb light and give dyes their color. More specifically, azo dyes obtain their orange color from a nitrogen to nitrogen double bond. In this experiment, methyl orange was synthesized through diazonium coupling with diazotized sulfanilic acid and N , N -dimethylaniline. The goal was to obtain as close to 100% yield as possible for the synthesis of methyl orange. The actual percent yield of 76.5822% was attributed to the slight dampness of the product. Keywords : methyl orange ,diazonium coupling, sulfanilic acis, N,N-diamethylaniline INTRODUCTION Dyes are used to give colors to substances, especially fabrics. Chromopohores, functional groups that absorb light, give color to these dyes. The most common chromophores are azo, nitro, and carbonyl groups. Auxochromes, functional groups that increase the intensity of the color, are also important parts of dyes. The most common chromophores are hydroxyl, amino, sulfonate, and carboxylate groups. A dye is a colored organic compound that is used to impart color to an object or a fabric. Azo dyes, colored compounds containing the -N=N- group, are the largest and more important class of dyes. In azo-dyeing, the fabric is first impregnated with an aromatic compound activated toward electrophilic substitution, then is treated with a
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Experiment 9 - CHM146L Organic Chemistry 2 Laboratory 1st...

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