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Sodium Sulfide Preparation and Standardization of Iodine Standard Solution:
Iodine Stock Solution c(½I₂) = 0.10 mol/L: Weigh 40.0 g of potassium iodide and 12.7 g of iodine. Dissolve in a small amount of water, then dilute to 1 L with water. Add 3 drops of hydrochloric acid, store in a brown bottle, and keep in a dark place. Standardize monthly with sodium thiosulfate solution.Sodium Sulfide.