Iodine and Sodium Thiosulfate Titration

I2 + 2Na2S2O3 → Na2S4O6 + 2NaI

Genel Bakış

Iodine oxidizes thiosulfate to tetrathionate while being reduced to iodide. This is the basis of iodometric titration, one of the most important analytical techniques in chemistry. Starch indicator turns blue-black with iodine and becomes colorless at the endpoint when all I₂ is consumed.

Katılımcılar

Rol Madde Katsayı Hal
Reaktan Iodine I 1 (aq)

Günlük Örnek

The vitamin C content of fruit juice can be determined by iodometric titration, where ascorbic acid reduces iodine before the starch endpoint.

Endüstriyel Önemi

Iodometric titration is a standard analytical method used in water quality testing (dissolved oxygen, chlorine residual), food analysis, and pharmaceutical quality control.

Özellikler

Tür
Redox
Geri Dönüşümlü
Hayır
Enerji
Ekzotermik
ΔH
-140,0 kJ/mol

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Frequently Asked Questions

What is the equation for Iodine and Sodium Thiosulfate Titration?
The balanced equation is: I₂ + 2Na₂S₂O₃ → Na₂S₄O₆ + 2NaI.
What type of reaction is Iodine and Sodium Thiosulfate Titration?
Iodine and Sodium Thiosulfate Titration is a redox reaction.
Is Iodine and Sodium Thiosulfate Titration exothermic or endothermic?
Iodine and Sodium Thiosulfate Titration is exothermic (releases energy). The enthalpy change (ΔH) is -140.0 kJ/mol.