- Pre Lab 15 Acid Orange Name Fill In The Reagents Table Below Substance Sulfanilic Acid 2 Naphthol Mass G Mw G Mol 1 (31.39 KiB) Viewed 61 times
- Pre Lab 15 Acid Orange Name Fill In The Reagents Table Below Substance Sulfanilic Acid 2 Naphthol Mass G Mw G Mol 2 (29.46 KiB) Viewed 61 times
- Pre Lab 15 Acid Orange Name Fill In The Reagents Table Below Substance Sulfanilic Acid 2 Naphthol Mass G Mw G Mol 3 (56.47 KiB) Viewed 61 times
- Pre Lab 15 Acid Orange Name Fill In The Reagents Table Below Substance Sulfanilic Acid 2 Naphthol Mass G Mw G Mol 4 (20.06 KiB) Viewed 61 times
Post-Lab Discussion Weight of Product % Yield, Melting Point Literature M.P. 164 °C Atom Efficiency. Atom Economy. E = Amax = How would the yield change if the dye was washed with cold water instead of cold ethanol? How is the resonance form of Acid Orange, drawn below, obtained? Redraw the molecule and show all arrows in your rationale. -N NaO₂S
Experiment # 15 Acid Orange Introduction Dyes and pigments are among the earliest evidences of man's ability to take advantage of the chemical properties of materials. The range of man's chemical creativity is evidenced in early cave paintings, from the Han Purple used to color the Terracotta Army (210 BC), and the use of the purple dye derived from murex mollusks during the time of Alexander the Great. The first "modern synthetic dye was mauveine, discovered by William Henry Perkin in in 1856 when he was only 18 years old, which he patented. His chemical discovery sparked the development of the chemical industry, fueled by the textile industry and coinciding with the Industrial revolution in mid-1800s London. In this lab, a diazo dye will be prepared. The first azo dye was chrysoidine or London Yellow, made by coupling aniline to m-phenylenediamine, and has been used to dye wool since 1875. Diazo dyes are among the most widely-used synthetic colorants, with applications ranging from cosmetics to food coloring. Do you ever wonder why the mac and cheese in Panda House looks very bright? It is because of Yellow #5 and Yellow #6. Look up the structure of these two dyes and research their possible effects to human physiology. In this green experiment, the diazonium will be produced without the use of sulfuric acid, which as you already know, is highly corrosive. Production of the diazonium ion from an aryl amine requires a strong acid, in this case, the sulfanilic acid starting material provides just that from its sulfonic acid (ArSO,H) functionality. No solvent will be used in the reaction except for a drop of water, and the purification will be accomplished by washing off any remaining starting material with ethyl acetate. HQ NH₂ LOH NaNO₂ ရှုံးပေးထားပ Procedure NaNO₂ Acid Orange Sulfanilic acid 2-Naphthol 0.1 0.1 0.1 Greener Organic Experiments 94 Substance Mass (g) MW (g/mol) Mmol Equivalents
Post-Lab Discussion Weight of Product 350-33 Melting Point_ 164 c Atom Economy E= % Yield 60's. Literature M.P. 164 °C Atom Efficiency Amax = 4830m