Product Notes
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Iodine solutions can also be used to determine Sulfite, Sulfur Dioxide, or Sulfide, according to the following reactions:
SO32- + I3- + H2O → SO42- + 2 H+ + 3 I-
SO2 + I3- + 2 H2O → SO42- + 4 H+ + 3 I-
S2- + I3- → S (precipitate) + 3 I-
In these reactions, it is better to add the Sulfite or Sulfide ion solution to an excess of acidified standard Iodine solution and then back-titrate the excess Iodine with standard Sodium Thiosulfate solution. This avoids loss of the analyte due to volatilization and thus leads to increased accuracy.
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