Vitamin C as Reducing Agent

C6H8O6 + I2 → C6H6O6 + 2HI

概述

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.

参与者

角色 物质 系数 状态
反应物 Ascorbic Acid C₆H₈O₆ 1 (aq)
反应物 Iodine I 1 (aq)

日常示例

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

工业重要性

维生素C碘量法是药典规定的维生素C含量测定标准方法，也是食品工业控制维生素C添加量的重要质控手段。

属性

类型
Redox
可逆
否
能量
放热
ΔH
-58.0 kJ/mol

相关反应

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) Chlorine Oxidation of Bromide Copper Oxidation by Nitric Acid Hypochlorite Oxidation of Hydrogen Peroxide Hydrogen Peroxide as Oxidizing Agent (Acidic) 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.