Vitamin C as Reducing Agent

C6H8O6 + I2 → C6H6O6 + 2HI

概要

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.

参加者

役割 物質 係数 状態
反応物 Ascorbic Acid C₆H₈O₆ 1 (aq)
反応物 Iodine I 1 (aq)

日常の例

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

産業上の重要性

ビタミンCのヨウ素滴定は標準的な医薬品品質管理法である。食品中のアスコルビン酸の抗酸化作用はその還元性に基づく。

特性

タイプ
Redox
可逆的
いいえ
エネルギー
発熱性
ΔH
-58.0 kJ/mol

関連する反応

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.