Chemistry II APPROVED: ___________ PREPARATION OF AZO DYES ABSTRACT In this experiment‚ the azo dyes p-nitrobenzene azoresorcinol and methyl orange were prepared by the azo coupling reaction. The p-nitrobenzene azoresorcinol dye was prepared from p-nitroaniline and resorcinol. The diazonium salt formed was from the reaction of the cold solution of dissolved p-nitroaniline in hydrochloric acid and water with the solution of sodium nitrite. Azo coupling was then followed by letting the diazonium
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Names:____________ Date Performed:_____ Experiment No:______ Score:_____________ AZO DYES PREPARATION INTRODUCTION AND OBJECTIVES The preparation of azo dyes is a standard reaction in an Organic Chemistry lab. Its adaptation to a parallel synthesis format is straightforward. Since the dyes vary widely in color‚ the diversity of this parallel synthesis becomes obvious. It includes techniques on diazotization and electrophilic substitiution. The experient belo is made to allow studens to
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spp and its application in dye decolorization Project supervisor: Dr. R. Masalu Lab scientist: Mr. Chuwa INTRODUCTION: Due to rapid industrialization and urbanization‚ a lot of chemicals including dyes are manufactured and used in day-to-day life. Dyes are synthetic and aromatic molecular structural compounds. According to their dissociation in an aqueous solution‚ dyes can be classified as acid‚ direct reactive dyes (anionic)‚ basic dyes (cationic) and disperse dyes (nonionic). They are used
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Visual Arts Topic: Textile and Design Manipulation Topic: Tie Dye Time: 4 sessions x 30 mins each General Objective To be able to use appropriate materials to create designs on fabric by various tie dyeing techniques. Specific Objectives At the end of the lesson students should be able to: ✓ 1. Define Tie Dye ✓ 2. List materials needed for tie dyeing ✓ 3. Explain Tie Dye as a resist dyeing ✓ 4. Know different techniques and explain each of
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answer through your investigations: 1. Which fabric (a) cotton‚ a natural fiber and (b) rayon‚ a synthetic fiber is best dyed with mayana-alum dye combination? 2. Often‚ mordants are added to fix the dye onto the fabrics. These are usually inorganic oxides or salts which form colored complex with the dye. Which mordant is more suited for dyeing cotton with dye extracted from eggplant skins? 3. Which mordant is more suitable for dyeing a synthetic fiber with the synthetic extract from mangosteen
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The release of dyes through contaminated water into the ecosystem from various industries like textile‚ leather‚ cosmetic‚ paper‚ pharmaceutical and food industries is not only a source of aesthetic pollution but also can cause human health disorders and adversely affects the aquatic life causing severe environmental problems worldwide. In view of increasing concern from perspective of environmental safety and health‚ physico-chemical and biological techniques are to be constantly explored for decolourization
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Natural dyes Natural dyes are dyes or colorants derived from plants‚ invertebrates‚ or minerals. The majority of natural dyes are vegetable dyes from plant sources – roots‚ berries‚bark‚ leaves‚ and wood — and other organic sources such as fungi and lichens. Archaeologists have found evidence of textile dyeing dating back to the Neolithicperiod. In China‚ dyeing with plants‚ barks and insects has been traced back more than 5‚000 years.[1] The essential process of dyeing changed little over time
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well-done Chromatography of dyes will provide you with enough data to determine if a liquid mixture is heterogeneous or homogenous . In a learning activity you can separate and possibly identify food dyes in some drinks mixes and food colors. The effect of solvent polarity or the ability to separate and elute compounds will also be demonstrated. In this experiment you will need to use the equation Xcm/Acm=RF value. The length of A‚ is the length of the longest line of the food dye or food coloring. The
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In this experiment the objective is to separate dyes in washable markers to see how many different dyes are combined to create one color. The technique used to separate the dyes in this experiment is called chromatography. The materials used consisted of – 3 pieces of chromatography paper‚ a tall clear glass‚ water‚ table salt‚ 1 tsp. measuring spoon‚ an 8 oz. measuring cup‚ pencil‚ ruler‚ 6 washable markers‚ and paper towels. The markers used in this experiment have to be water soluble therefore
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Natural dyes are dyes or colorants derived from plants‚ invertebrates‚a or minerals. The majority of natural dyes are vegetable dyes from plant sources – roots‚ berries‚ bark‚ leaves‚ and wood — and other organic sources such as fungi and lichens. Archaeologists have found evidence of textile dyeing dating back to the Neolithic period. In China‚ dyeing with plants‚ barks and insects has been traced back more than 5‚000 years.[1] The essential process of dyeing changed little over time. Typically
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