Volume 2

A system of chemistry of inorganic bodies / By Thomas Thomson.

  • Thomson, Thomas, 1773-1852.
Date:
1831
Catalogue details

Licence: Public Domain Mark

Credit: A system of chemistry of inorganic bodies / By Thomas Thomson. Source: Wellcome Collection.

    63/968 (page 45)
    Ls 1. Arsenic forms two acids, the arsenious and arsenic, the last’ of which Mitcherlich has shown to be isomorphous with the phosphoric acid. 2. Antimony forms two acids, the antimonious and antimonic, similar in their constitution to the arsenious and arsenic. Rose has.shewn that arsenic and antimony are isomorphous bodies. The acids of the two metals being similarly constituted, ought also to be isomorphous bodies. 3. Chromium forms only one acid similar in its constitution to the phosphoric, arsenic, and antimonic. Whether it be isomorphous with them has not hitherto been éxamined., 4, The peroxide of uranium possesses the double property of combining with bases and with acids. Hence it might be called uranic acid. no additional remarks to those made while treating of them respectively in the first volume of this work. 6. The oxide which I described in the first volume of this work (p. 516), under the name of bin-oxide of manganese, seems, as I have mentioned before, to be capable of combining in definite proportions with bases. ‘hus the species of man- ganese ore, to which Haidinger has given the name of Psilome- lanite, appears from the analysis of Dr. Turner to be a com- pound of 8 atoms subsesquihydrate of binoxide, 1 atom quadromanganite of barytes. By quadromanganite of barytes, I mean a compound of 4 atoms binoxide of manganese with one atom of barytes. I have also formed definite compounds of this oxide and lime. From this might therefore be called manganous acid. Manganic acid possesses decided acid characters, It is curious to see an alkalifiable base like manganese assum- ing acid properties, when it combines with more oxygen than exists in the alkaline compounds of the same base and oxygen. Tin and gold seem to possess similar characters, and probably the remark might be applied to the greater number of the bodies which have been placed under the division of noble bases. DIVISION II.—ACIDS WITH A COMPOUND BASE. The acids of oxygen, with a compound base, are very nume- rous, and are daily augmenting as chemists extend their Class I.