Скачать или смотреть Azo Dyes Demystified: The Chemistry Behind Methyl Orange Synthesis

Methyl orange is a prominent azo dye known for its vivid color changes and applications as a pH indicator. Azo dyes, characterized by the N=N group, are synthesized by coupling a diazonium ion with a phenol or aromatic amine. The synthesis of methyl orange involves diazotizing sulfanilic acid and coupling it with dimethylaniline, resulting in a bright dye used in textile dyeing and as an analytical chemistry tool. The dye changes color sharply between pH 3.1 (red) and pH 4.4 (yellow), making it useful for titrations. Despite their utility, azo dyes like methyl orange pose environmental and health risks due to their potential toxicity and persistence, highlighting the need for careful management and safer alternatives.

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References and uses:
References:
Procedure adapted from:
Adams, R., Johnson, J. R., & Wilcox, C. F. (1979). Laboratory experiments in Organic Chemistry. Macmillan.
Additional information from:
Wikipedia contributors. (2024, June 6). Methyl orange. In Wikipedia, The Free Encyclopedia. Retrieved 13:10, July 2, 2024, from https://en.wikipedia.org/w/index.php?...
Wikipedia contributors. (2024, April 25). Azo dye. In Wikipedia, The Free Encyclopedia. Retrieved 13:12, July 2, 2024, from https://en.wikipedia.org/w/index.php?...

Chapters:
00:00 Introduction
03:39 Diazotization
05:59 Coupling
07:53 Purification
09:28 Analysis



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