After acidification of the sample, the sulfides are moved in the form of hydrogen sulfide with an inert gas and collected in a solution of zinc acetate. Iodine used in excess, reacts on the suspension of zinc sulfide in some conditions of acidity. Excess iodine titrated with sodium thiosulfate solution used to calculate the amount of sulphides.
I ask you to give me the chemical reactions involved in this assay.
Thank you very much Prof. Sokratis Papaspyrou for your help. In my case study, the preparation of 0.025 N iodine solution by dissolving 20-25 g of potassium iodide (KI) in a little of deionized water and then add 3.175 g iodine (I2) . After dissolution of the iodine, adjusting the volume to 1 liter and the calibration solution with a solution of 0.025 N sodium thiosulfate solution using a starch indicator.
So I don't have a IO3- in my reactions?
Your suggestions .
The first reaction is just a method to make triiodide more precisely than weighting out the slightly unstable I2.
If you consider to replace it as: I- + I2 -> I3-.
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