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Methyl OrangeHere is the structure of methyl orange in acidic solution:
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.
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Last Revised 02/23/18.