A Spectrophotometric Study of Tripositive Manganese in Hydrochloric Acid Solution

James A. Ibers; Norman Davidson

doi:10.1021/ja01166a111

A Spectrophotometric Study of Tripositive Manganese in Hydrochloric Acid Solution

James A. Ibers, Norman Davidson

Chemistry

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Abstract

The equilibrium optical density, due to a higher manganese chloride, of a solution of manganese- (II) in concentrated hydrochloric acid oxidized by chlorine obeys the relation D = Ke[Mn⁺⁺] [Cl₂]^1/2, implying that the colored species is a chloro-complex of manganese(III) formed by the reaction Mn⁺⁺+ 1/2Cl₂= Mn^III+ Cl⁻. The extinction coefficients of manganese(III) were measured, and the equilibrium constant, K = [Mn^III]/[Mn⁺⁺][Cl₂]^1/2(liter/moles),^1/2in 10.1 F hydrochloric acid was evaluated as 0.19 (25°) and 0.33 (0°). There is no optical interaction absorption in mixed solutions of manganese(II) and (III). Spectrophotometric evidence for the formation of chloro-complexes of manganese(II) is presented. The ratio of the amount of tripositive manganese to the amount of chlorine formed by the reaction of permanganate with a manganese(II) solution in hydrochloric acid has been investigated.

Original language	English (US)
Pages (from-to)	4744-4748
Number of pages	5
Journal	Journal of the American Chemical Society
Volume	72
Issue number	10
DOIs	https://doi.org/10.1021/ja01166a111
State	Published - Oct 1 1950

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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title = "A Spectrophotometric Study of Tripositive Manganese in Hydrochloric Acid Solution",

abstract = "The equilibrium optical density, due to a higher manganese chloride, of a solution of manganese- (II) in concentrated hydrochloric acid oxidized by chlorine obeys the relation D = Ke[Mn++] [Cl2]1/2, implying that the colored species is a chloro-complex of manganese(III) formed by the reaction Mn+++ 1/2Cl2= MnIII+ Cl−. The extinction coefficients of manganese(III) were measured, and the equilibrium constant, K = [MnIII]/[Mn++][Cl2]1/2(liter/moles),1/2in 10.1 F hydrochloric acid was evaluated as 0.19 (25°) and 0.33 (0°). There is no optical interaction absorption in mixed solutions of manganese(II) and (III). Spectrophotometric evidence for the formation of chloro-complexes of manganese(II) is presented. The ratio of the amount of tripositive manganese to the amount of chlorine formed by the reaction of permanganate with a manganese(II) solution in hydrochloric acid has been investigated.",

author = "Ibers, {James A.} and Norman Davidson",

year = "1950",

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T1 - A Spectrophotometric Study of Tripositive Manganese in Hydrochloric Acid Solution

AU - Ibers, James A.

AU - Davidson, Norman

PY - 1950/10/1

Y1 - 1950/10/1

N2 - The equilibrium optical density, due to a higher manganese chloride, of a solution of manganese- (II) in concentrated hydrochloric acid oxidized by chlorine obeys the relation D = Ke[Mn++] [Cl2]1/2, implying that the colored species is a chloro-complex of manganese(III) formed by the reaction Mn+++ 1/2Cl2= MnIII+ Cl−. The extinction coefficients of manganese(III) were measured, and the equilibrium constant, K = [MnIII]/[Mn++][Cl2]1/2(liter/moles),1/2in 10.1 F hydrochloric acid was evaluated as 0.19 (25°) and 0.33 (0°). There is no optical interaction absorption in mixed solutions of manganese(II) and (III). Spectrophotometric evidence for the formation of chloro-complexes of manganese(II) is presented. The ratio of the amount of tripositive manganese to the amount of chlorine formed by the reaction of permanganate with a manganese(II) solution in hydrochloric acid has been investigated.

AB - The equilibrium optical density, due to a higher manganese chloride, of a solution of manganese- (II) in concentrated hydrochloric acid oxidized by chlorine obeys the relation D = Ke[Mn++] [Cl2]1/2, implying that the colored species is a chloro-complex of manganese(III) formed by the reaction Mn+++ 1/2Cl2= MnIII+ Cl−. The extinction coefficients of manganese(III) were measured, and the equilibrium constant, K = [MnIII]/[Mn++][Cl2]1/2(liter/moles),1/2in 10.1 F hydrochloric acid was evaluated as 0.19 (25°) and 0.33 (0°). There is no optical interaction absorption in mixed solutions of manganese(II) and (III). Spectrophotometric evidence for the formation of chloro-complexes of manganese(II) is presented. The ratio of the amount of tripositive manganese to the amount of chlorine formed by the reaction of permanganate with a manganese(II) solution in hydrochloric acid has been investigated.

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A Spectrophotometric Study of Tripositive Manganese in Hydrochloric Acid Solution

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