Synopsis
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Présentation de l'éditeur
In his classical researches on the Periodic System of the Elements, Mendeleeff has called attention to the fact that all the oxides of the type RO cannot be considered as true peroxides. Some of them, as for example barium peroxide, Ba Og, give hydrogen peroxide with acids, and may therefore be considered as derivatives of that compound, whilst others, such as manganese dioxide, Mn Og, and lead dioxide, Pb Og, do not so react with acids. To distinguish these two classes of oxides it is now customary to restrict the name peroxide to compounds of the first class, those of the second class being termed dioxides. In various papers Tanatar has expressed doubts as to whether there is really a constitutional difference between the true peroxides and the dioxides (false peroxides), he being of the opinion that the differences in behaviour of these two classes can be accounted for on thermochemical grounds. A mongst other experimental evidence brought forward, he states that ordinary nickel dioxide, prepared by the action of sodium hypobromite on nickelous hydroxide, yields hydrogen peroxide with acids, its presence being demonstrated by the oxidizing action of the solution on potassium iodide, and by the decolorization of potassium permanganate ;also, that hydrogen peroxide can be obtained from it in quantity by interaction with hydrocyanic acid in the presence of potassium cyanide. This evidence, if substantiated, would be of special importance, since Pellini and Meneghini have prepared a greyish-green compound, Ni02,xH20, which gives all the reactions of hydrogen peroxide and is quite different in its behaviour from ordinary nickel dioxide. This would point to the existence of two structural isomerides, yO ON i( I and Nif ,o %0 whereas if Tanatar sobservations were correct there could be no such difference in structure.
(Typographical errors above are due to OCR software and don't occur in the book.)
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