Chemical gazette Volume 11; or, Journal of practical chemistry, in all its applications to pharmacy, arts and manufactures

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1853 Excerpt: ...fluoride of palladamine in a dry form all failed, in consequence of the readiness with which the salt is decomposed. It is remarkable that it possesses this property in common with the oxysalts of palladamine; their great solubility also forms a remarkable deviation from the general character of the other haloid compounds. With the fluoride the author concludes the description of the salts of palladamine, as the salts described sufficiently characterize the substance; palladdiamine and its compounds are next brought under consideration. To be continued. On the Coloration of the Salts of Protoxide of Manganese. By A. Gorged. I. Purification of the Salts of Manganese. The cause of the coloration of the salts of protoxide of manganese has not yet been determined. They generally present s faint rosy tint both in the crystallized state and in solution; but it is supposed that this colour is foreign to them, and that, when sufficiently purified, they are colourless. Chemists attribute this rose colour to the presence of a small quantity either of permanganic acid, or a salt of sesquioxide of manganese, or of a salt of cobalt; the most generally received opinion is, that it is due to both these latter causes. From my own experiments on this subject, T think I may conclude that these salts of manganese possess a rose colour independently of the three causes above mentioned. In the first place, I may observe that the presence of permanganic acid is inadmissible; it is sufficient to remember that the permanganates are decolorized by protosalts of manganese, with the production of an insoluble peroxide. To establish the fact of the existence of a peculiar coloration in the salts of protoxide of manganese, it is only necessary to show that they may be obtained of a ros...