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    Methyl Orange

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    Methyl Orange is an acid-base indicator. In dilute solution, at pH greater than 4.4, it is yellow. At pH=3.2 the solution appears red. Draw a structure of the species that is formed at the lower pH of the acid proton adds to the azo nitrogen atom adjacent to the aromatic ring containing the -SO3 group. Why does the proton add to this particular nitrogen when two other nitrogen atoms are available in the molecule?

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    Solution Preview

    The structures are at this website: http://antoine.frostburg.edu/chem/senese/101/features/methylorange.shtml

    The N group with two methyl groups attached (-N(CH3)2) is not a good site for ...

    Solution Summary

    This solution is provided in 128 words. It provides a reference to a website for structures formed in the solution. It explains why the proton adds to a specific nitrogen and how this relates to charge of the atom.