As described by Fox [29], the color development in the selected reaction results as a balance of the formation of HNO2, protonation of the naphthalene derivative, and the potential decomposition of the azo dye at lower pH values (such as 10% HCl).
Asdescribed by Fox [29], the color development in the selected reactionresults as a balance of the formation of HNO2, protonation ofthe naphthalene derivative, and the potential decomposition of theazo dye at lower pH values (such as 10% HCl).