Reduction of Manganese Dioxide by HCl

MnO2 + 4HCl → MnCl2 + Cl2 + 2H2O

Visão geral

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.

Participantes

Papel Substância Coeficiente Estado
Reagente Hydrochloric Acid HCl 4 (aq)
Produto Chlorine Cl 1 (g)
Produto Water H₂O 2 (l)

Exemplo do cotidiano

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

Importância industrial

Antes da eletrólise, este era o principal método industrial de produção de cloro. Continua a ser uma preparação laboratorial padrão para pequenas quantidades de gás cloro.

Propriedades

Tipo
Redox
Reversível
Não
Energia
Exotérmico
ΔH
-35,0 kJ/mol

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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.