Diazotization Method

- Authors: Kamya Goyal1, Navdeep Singh2, Shammy Jindal3, Rajwinder Kaur4, Anju Goyal5, Rajendra Awasthi6
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View Affiliations Hide AffiliationsAffiliations: 1 Laureate Institute of Pharmacy, Jawalamukhi, Himachal Pradesh, India 2 Laureate Institute of Pharmacy, Jawalamukhi, Himachal Pradesh, India 3 Laureate Institute of Pharmacy, Jawalamukhi, Himachal Pradesh, India 4 Chitkara College of Pharmacy, Chitkara University, Rajpura, Punjab, India 5 Chitkara College of Pharmacy, Chitkara University, Rajpura, Punjab, India 6 Amity Institute of Pharmacy, Amity University Uttar Pradesh, Noida, Uttar Pradesh, India
- Source: Advanced Techniques of Analytical Chemistry: Volume 1 , pp 97-104
- Publication Date: February 2022
- Language: English
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.
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