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Sodium Sulfide Analytical Procedure
Sample Dissolution: Weigh approximately 10 g of solid sample, accurate to 0.01 g. Transfer into a 400 mL beaker, add 100 mL of water, and heat to dissolve. After cooling, transfer to a 1 L volumetric flask. Dilute to the mark with carbon dioxide-free water and mix well. This Sodium Sulfide solution is designated as Test Solution B.