Iodine and Sodium Thiosulfate Titration

I₂ + 2Na₂S₂O₃ → Na₂S₄O₆ + 2NaI

Descripción general

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.

Participantes

Rol	Sustancia	Coeficiente	Estado
Reactivo	Iodine I	1	(aq)

Ejemplo cotidiano

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

Importancia industrial

La titulación yodométrica es un método analítico estándar utilizado en el control de calidad del agua (oxígeno disuelto, cloro residual) y en el análisis de alimentos y productos farmacéuticos.

Propiedades

Tipo: Redox
Reversible: No
Energía: Exotérmico
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.