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Iodine Solution Titration Check of Sodium Sulfide:
Pipette 25 mL of the iodine standard titration solution into a 250 mL iodine flask. Add 25 mL of water and 10 mL of glacial acetic acid solution.
While swirling, add via pipette the previously titrated Solution B (from step 2). Titrate with the sodium thiosulfate standard titration solution until the solution turns pale yellow. Then, add 2 mL of starch indicator solution and continue titration until the blue color disappears. Record the volume consumed as V₂.Sodium Sulfide.