A NEW METHOD FOR THE DETERMINATION OF RESIDUAL SULFURIC ACID IN WOOL

Many methods have hitherto been proposed for the determination of residual sulfuric acid in wool, but they are not entirely satisfactory. A new accurate and convenient method for the same purpose is presented here by the authors, viz., to replace first the residual H2SO4 in wool by warming with 0.13_??_0.25 N HCL at 75°C for 20 minutes and to determine the total amount of acids and HCL by titration with 0.1 N NaOH and 0.1 N AgNO3 stepwisely, and to calculate H2SO4 by reducting the amount of HCl from total acids (H2SO4+HCl). Thus, H2SO4 in wool may be expressed as mg/g wool.