Sagot :
Answer:
Pauly's diazo Test
Sulphanilic acid upon diazotization in the presence of sodium nitrite and hydrochloric acid results in the formation a diazonium salt. The diazonium salt formed couples with either tyrosine or histidine in alkaline medium to give a red coloured chromogen (azo dye).
Explanation:
source: Gøöglë