106. Determine the concentration of sulfate ions (mg/dm3) in biologically treated wastewater from a hydrolysis yeast production plant if a 300 ml water sample was placed in a conductometric titration cell, two platinum electrodes were immersed in it and titrated with a 1 N solution of Ba(CH3COO)2, recording the electrical conductivity of the solution after each portion of added titrant. The volume at the end point of titration was 4.6 cm3.

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