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
Iron(II) to Iron(III) Oxidation by Oxygen
Bleaching with Sodium Hypochlorite
Copper Reduction of Silver Ion
Aqua Regia Dissolving Gold
Cerium(IV) Reduction by Iron(II)
Copper Oxidation by Nitric Acid
Hypochlorite Oxidation of Hydrogen Peroxide
Hydrogen Peroxide as Oxidizing Agent (Acidic)
Hydrogen Peroxide Disproportionation
Displacement of Hydrogen from Acid by Magnesium
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.