• Source: Acid orange 5

5.180.24.3/info/acid" target="_blank">Acid 5.180.24.3/info/orange" target="_blank">orange 5 is a compound with formula Na(C6H5NHC6H4N=NC6H4SO3). It is an azo dye.
It is also used as a pH indicator; it is red in pH under 1.4, 5.180.24.3/info/orange" target="_blank">orange-yellow in pH over 3.2.




Preparation


5.180.24.3/info/acid" target="_blank">Acid 5.180.24.3/info/orange" target="_blank">orange 5 may be prepared by diazotization of sulfanilic 5.180.24.3/info/acid" target="_blank">acid, followed by reaction with diphenylamine:

HO3SC6H4N+2 + (C6H5)2NH → HO3SC6H4N=NC6H4N(H)C6H5 + H+




References

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• List of dyes