Reduction of Manganese Dioxide by HCl

MnO2 + 4HCl → MnCl2 + Cl2 + 2H2O

概要

Manganese dioxide oxidizes hydrochloric acid to produce chlorine gas, with Mn(IV) being reduced to Mn(II). Two of the four HCl molecules are oxidized (Cl⁻ → Cl₂) while two provide the acid environment. This was historically the main method for chlorine gas production before the chlor-alkali process.

参加者

役割 物質 係数 状態
反応物 Hydrochloric Acid HCl 4 (aq)
生成物 Chlorine Cl 1 (g)
生成物 Water H₂O 2 (l)

日常の例

This was the reaction Carl Wilhelm Scheele used to discover chlorine gas in 1774, calling it dephlogisticated muriatic acid.

産業上の重要性

電気分解以前は塩素製造の主要な工業的方法であった。少量の塩素ガスの標準的な実験室調製法として現在も使用される。

特性

タイプ
Redox
可逆的
いいえ
エネルギー
発熱性
ΔH
-35.0 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 Reduction of Manganese Dioxide by HCl?
The balanced equation is: MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O.
What type of reaction is Reduction of Manganese Dioxide by HCl?
Reduction of Manganese Dioxide by HCl is a redox reaction.
Is Reduction of Manganese Dioxide by HCl exothermic or endothermic?
Reduction of Manganese Dioxide by HCl is exothermic (releases energy). The enthalpy change (ΔH) is -35.0 kJ/mol.