113. Solving a chemistry problem

113. Solving a chemistry problem

3. To 25 ml of H2S solution was added 50 ml of 0.01960 N. I2 solution (feq.=1/2) and excess iodine were titrated with 11 ml of 0.02040 N. Na2S2O3 (feq=1). Calculate the concentration of H2S in the solution. answer 0.5150 g/l

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