Reduction of Manganese Dioxide by HCl

MnO2 + 4HCl → MnCl2 + Cl2 + 2H2O

Übersicht

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.

Teilnehmer

Rolle Substanz Koeffizient Zustand
Reaktant Hydrochloric Acid HCl 4 (aq)
Produkt Chlorine Cl 1 (g)
Produkt Water H₂O 2 (l)

Alltägliches Beispiel

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

Industrielle Bedeutung

Before electrolysis, this was the primary industrial method for chlorine production. It remains a standard lab preparation for small amounts of chlorine gas.

Eigenschaften

Typ
Redox
Reversibel
Nein
Energie
Exotherm
ΔH
-35,0 kJ/mol

Verwandte Reaktionen

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.