This method was first invented in the year 1858 and after the proper

research, this method was easy to be applied in synthetic dye industry. This method

was first used in the determination of dyes. The progression of reaction and the

mechanism concerned in this method was first predictable by scientist Peter Griess.

The major mechanism of this method is when the aromatic amine which is primary in

nature essentially starts a reaction with acidic environment consisting of sodium nitrite,

which is further changed into diazonium salt. A diazonium salt is fashioned which is

close with one other amine (phenol), and distorted into intense colored azo dye. The

basic principle concerned in this method is based on the amines which are primary

aromatic in nature, after that the sample reacts with sodium nitrite compound in the

occurrence of HCl hydrochloric acid to form a diazonium salt. The end point is

detected by the formation of the blue colour with starch iodide paper. Another method

for the detection of end point is by immersing the platinum electrodes in the resulting

solution and it is also detected by the dead-stop end point method. The different

titration method includes direct method, indirect method and other method used in

Diazotization technique. In the procedure, a potentiometer and electrode system were

used, and the deflection is observed. The temperature of the reaction was maintained at

0-5 °C. So, in this method we studied the basic principle involved, procedure, methods

of titration, and the appropriate applications of this technique.

Diazotization Method