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Chemical formula of sodium thiosulfate: Na2S2O3 monoclinic white crystalline powder, certain gravity 1.667, soluble in water, insoluble in alcohol, was heated in air decomposed into sodium oxide and sulfur dioxide. Burned in pure oxygen is generated sodium sulfate, sodium sulfide and sulfur. chlorine cure anhydrous drug analysis strategy name : sodium thiosulfate ?C Determination of sodium thiosulfate ?C Redox Titration Application: This strategy utilizes thio redox titration sodium content. This method is suitable for the determination of sodium thiosulfate. Principle of the strategy: Take the test quantity, dissolved in water, add starch indicator answer, titration with iodine solution droplets were determined to continue the blue. Each 1mL iodine titration solution (0.05mol / L) is equivalent to 15.81mg of Na2S2O3. , That is too. Reagents: 1. Water (put the new boiling to room temperature) 2. Iodine titration solution (0.05mol / L) three. Sodium hydroxide remedy (1mol / L) 4. Methyl orange indicator answer five. Sulfuric acid titration solution (0.5mol / L) 6. bicarbonate 7 starch indicator solution 8 9 phenolphthalein indicator solution Methyl red ?C bromocresol green mixed indicator solution 10. trioxide benchmark 11 benchmark potassium hydrogen phthalate 12. sodium sulfate anhydrous base sodium Equipment: Sample preparation: 1. iodine titration remedy (0.05mol / L) preparation: Take iodine 13.0g, add 36g potassium iodide dissolved in 50mL of water, add three drops of hydrochloric acid and also the degree of water to create into a 1000mL, shake with melting down glass filter filtration. Calibration: Take dried at 105 ?? to constant weight basis arsenic trioxide of about 0.15g, accurately weighed, add sodium hydroxide remedy (1mol / L) 10mL, micro-heat to dissolve, add water 20mL and 1 drop of methyl orange indicator answer, sulfuric acid titration solution (0.
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