Colorimetric Estimation and Photometric Titration of Sodium Thiosulphate Using Cacotheline as Reagent

Department of Engineering Chemistry, Andhra University, Waltair-530 003 Manuscript received 10 June 1982, revised 11 February 1983, accepted 3 August 1983 CACOTHELINE of unspecified purity has often been used as a redox indicator and for the detection and colorimetric determination of tin(II), iron(II) and vanadium(III) 1-3. The preparation of highly pure cacotheline and its use as an oxidimetric reagent has been reported 4,5 . The pure sample was used as a reagent by Murty and Rao6 +for the detection of thiosulphate. This pure reagent has now been studied for photometric titration and colorimetric estimation of thiosulphate