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Sodium Sulphide 60% Yellow/Red Flakes.Add 10 mL of glacial acetic acid solution and 2 mL of starch indicator solution. Titrate with the iodine standard titration solution until a blue color appears, indicating the endpoint. Record the volume consumed as V₃.
Separately, pipette 10 mL of Solution B and titrate with the sodium thiosulfate standard titration solution. When the solution turns pale yellow, add 2 mL of starch indicator solution and continue titration until the blue color disappears. Record the volume consumed as V₂.Sodium Sulphide 60% Yellow/Red Flakes.