Vitamin C as Reducing Agent

C6H8O6 + I2 → C6H6O6 + 2HI

Tổng quan

Ascorbic acid (vitamin C) reduces iodine to iodide while being oxidized to dehydroascorbic acid. The enediol group on ascorbic acid is the active reducing center, losing two electrons. This reaction is the basis of the standard method for determining vitamin C content in foods.

Người tham gia

Vai trò Chất Hệ số Trạng thái
Chất phản ứng Ascorbic Acid C₆H₈O₆ 1 (aq)
Chất phản ứng Iodine I 1 (aq)

Ví dụ thực tế

School science experiments often measure vitamin C in different juices by titrating with iodine solution until the starch indicator turns blue-black.

Tầm quan trọng công nghiệp

Vitamin C iodimetric assay is a standard pharmaceutical quality control method. Ascorbic acid's antioxidant action in food is based on its reducing properties.

Tính chất

Loại
Redox
Thuận nghịch
Không
Năng lượng
Tỏa nhiệt
ΔH
-58,0 kJ/mol

Phản ứng liên quan

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Frequently Asked Questions

What is the equation for Vitamin C as Reducing Agent?
The balanced equation is: C₆H₈O₆ + I₂ → C₆H₆O₆ + 2HI.
What type of reaction is Vitamin C as Reducing Agent?
Vitamin C as Reducing Agent is a redox reaction.
Is Vitamin C as Reducing Agent exothermic or endothermic?
Vitamin C as Reducing Agent is exothermic (releases energy). The enthalpy change (ΔH) is -58.0 kJ/mol.