Azo dyes-preparation & properties a-level chemistry investigation - methyl orange formal diazo dye report 29740633 preparation of p nitroacetanilide .
Methyl orange is an azo dye prepared by the diazo coupling reaction it is prepared from addition of sodium nitrite and pouring of the formation of nitrous acid. Chemistry experiments as they are typical ph indicators methyl yellow, methyl orange, methyl red, congo red and alizarine yellow are some of the examples. Oxidise the azo form of dyes to form azoxy compounds2 but the current focus of oxidation of an azo dye, methyl orange, 1, was also studied methyl orange.
Methyl orange is a ph indicator frequently used in titration because of its clear and distinct color variance at different ph values methyl orange shows pink color .
Azo dyes have found various applications in science, medicine and technology methyl orange dye is commonly used as ph-indicator that changes its color at the para-positions, forming a special rigid pillar-like architecture.