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Sodium Sulfide Treatment and Titration:
Pipette 200 mL of Solution B into a 500 mL volumetric flask. Sequentially add 40 mL of sodium carbonate solution, 80 mL of zinc sulfate solution, and 25 mL of ethanol. Dilute to the mark with water and mix well.
Filter the mixture, discard the first 10 mL of filtrate, then pipette 100 mL of the filtrate into a 500 mL conical flask.Sodium Sulfide.