Electrosynthesis of phenolphthalein using cyclic voltammetry technique

Abstract

The synthesis of the indicator of phenolphthalein has been investigated in this research by an electrochemical method. In this method, electro-synthesis of phenolphthalein was performed in a 2 M solution of phenol and 1 M solution of phthalic anhydride in sulfuric acid medium, using the cyclic voltammetry technique in a potential range of -0.1 to 1.5 V and scan rate 50 mV/s. Ag/AgCl, platinum and graphite electrodes were respectively used as reference, counter and working electrode. The combination of electro-synthesis in accordance with the detailed steps of the purification and the method of determination of the melting point and FT-IR, HPLC, SEM and UV-Vis devices were used and were confirmed to perform diagnostic tests.