Definitions
from The Century Dictionary.
- Obtained from manganese.
- an acid obtained in a state of aqueous solution from manganese by decomposing its barium salt with sulphuric acid. It forms a deepred solution, which decomposes with evolution of hydrogen on exposure to light or when heated. Potassium permanganate is the most important salt. It forms crystals which are nearly black, but give with water a purple solution. It is used as an oxidizing agent, and is a powerful antiseptic.
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Chem.) Pertaining to, or designating, one of the higher acids of manganese, HMnO4, which forms salts called
permanganates .
Etymologies
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Examples
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~ When carbon dioxide is passed through a solution of a manganate a part of the manganese is changed into manganese dioxide, while the remainder forms a salt of the unstable acid HMnO_ {4}, called permanganic acid.
An Elementary Study of Chemistry William McPherson
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It is obtained by treating a solution of permanganate of baryta with sulphuric acid, when sulphate of baryta falls, and the permanganic acid remains dissolved in the water.
Scientific American Supplement, No. 401, September 8, 1883 Various
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On electrolyzing a manganiferous solution of copper nitrate, red permanganic acid appeared in a stratum floating above the platinum disk coated with brown peroxide.
Scientific American Supplement, No. 441, June 14, 1884. Various
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Organic acids, ferrous oxide, chromic oxide, ammonium salts, etc., prevent the formation of peroxide and the red color produced by permanganic acid.
Scientific American Supplement, No. 441, June 14, 1884. Various
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In very dilute strongly acid nitric solutions there is formed only permanganic acid, which according to Riche is plainly visible in solutions containing
Scientific American Supplement, No. 441, June 14, 1884. Various
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Manganese forms no less than six different oxides -- viz., protoxide, sesquioxide the red oxide, the binoxide or peroxide, manganic acid, and permanganic acid.
Scientific American Supplement, No. 401, September 8, 1883 Various
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If a solution of ferric oxide and manganese ammonium oxalate is submitted to electrolysis, without the previous addition of ammonium oxalate, the characteristic color of permanganic acid immediately makes its appearance, and the peroxide gradually precipitates itself on the positive, while the iron is deposited on the negative electrode.
Scientific American Supplement, No. 299, September 24, 1881 Various
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All other permanganates, as well as permanganic acid itself, give solutions of the same color.
An Elementary Study of Chemistry William McPherson
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In both cases the characteristic coloration from permanganic acid is developed by the action of the current at the positive pole; this, however, disappears in the direction of the negative electrode.
Scientific American Supplement, No. 299, September 24, 1881 Various
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~ Manganese forms two unstable acids, namely, manganic acid and permanganic acid.
An Elementary Study of Chemistry William McPherson
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