Standardization of 0.1 N Sodium Thiosulfate (Na2S2O3)

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12 Terms

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Sodium Thiosulfate

reducing agent

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anhydrous

efflorescent nature will be _ (no water)

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2

factor Sodium Thiosulfate (Na2S2O3)

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boiled and cooled water

prevents bacterial decomposition of sodium thiosulfate

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Indirect Iodometry

Sodium Thiosulfate (Na2S2O3) [Type of titration:

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Redox reaction

Sodium Thiosulfate (Na2S2O3) Type:

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K2Cr2O7

Sodium Thiosulfate (Na2S2O3) Oxidizing agent

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Na2S2O3

Sodium Thiosulfate (Na2S2O3) Reducing agent (titrant, volumetric solution, reacts with the liberated I2)

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HCl

Sodium Thiosulfate (Na2S2O3) Acidifying agent (helps liberate I2)

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KI

Sodium Thiosulfate (Na2S2O3) Reducing agent for K2Cr2O7 (to liberate I2)

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7K2Cr2O7 + 6KI + 14HCl → 3I2 + 2CrCl3 + 8KCl + 7H2O

I2 + 2Na2S2O3 → 2NaI + Na2S4O6

Sodium Thiosulfate (Na2S2O3) Chemical reactions

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Sodium Thiosulfate (Na2S2O3)

Factor (of analyte): ________

(because in the half-equation reaction of dichromate, an oxidizing agent

in acidic medium, it gained a total of 6e-.

Cr2O7

-2 + 14H+ + 6e- → 2Cr+3 + 7H2O