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F. A. Senese
Dept. of Chemistry

Methyl Orange

Here is the structure of methyl orange in acidic solution:
Methyl orange in acidic solution.
Click the image for a 3D Chime structure.
The molecule absorbs blue-green light, which makes its solution appear red. Notice that the nitrogen bearing the positive charge is involved in a double bond.

In the basic form of methyl orange, a hydrogen ion is lost from the -NN- bridge between the rings, and the electrons formerly used to bind the hydrogen neutralize the positive charge on the terminal nitrogen, so that it is no longer able to pi-bond. Solutions of the methyl orange appear yellow in alkaline solution.
Methyl orange in basic solution.
Click the image for a 3D Chime structure.


General Chemistry Online! Methyl Orange

Copyright © 1997,1998 by Fred Senese
Comments & questions to senese@antoine.frostburg.edu
Last Revised 12/10/01.
URL: http://antoine.frostburg.edu/chem/senese/101/features/methylorange.shtml