METHOD FOR TITRIMETRIC DETERMINATION OF WEIGHT RATIO OF BASIC SUBSTANCE IN STANDARD SAMPLE WITH COMPOSITION β,β'-DIHYDROXY DIETHYL SULPHIDE

摘要

FIELD: chemistry.;SUBSTANCE: 5 cm³ distilled water and 3 cm³ concentrated hydrochloric acid are added to the analysed sample weighing 0.1-0.3 g after dissolution thereof in 40 cm³ glacial acetic acid and using an ultrasonic bath; the mixture is heated to 30-35°C and titration is carried out with bromide-bromate solution until a yellow colour is obtained; methyl red indicator solution in ethyl alcohol is added and post-titration is carried out with the process solution until the pink colour of the indicator turns pale-yellow; a blank test is carried out under similar conditions and in both cases the volume of bromide-bromate solution used during titration is recorded; the weight ratio of the basic substance in the standard sample of the composition β,β'-dihydroxy diethyl sulphide is calculated from a given relationship, and the final result is the arithmetic average of the results of two parallel tests, deviation between which must not exceed ±1.0%.;EFFECT: high accuracy and simple analysis.;2 cl, 2 tbl