Notes for students in chemistry : being a syllabus of chemistry compiled mainly from the manuals of Fownes-Watts, Miller, Wurz, and Schorlemmer / by Albert James Bernays.

  • Albert Bernays
Date:
1878
Catalogue details

Licence: Public Domain Mark

Credit: Notes for students in chemistry : being a syllabus of chemistry compiled mainly from the manuals of Fownes-Watts, Miller, Wurz, and Schorlemmer / by Albert James Bernays. Source: Wellcome Collection.

    84/168 (page 72)
    [XXXIX. GalUum Ga = 68. Never native. A triad, intermediate between Aluminum and Indium. Discovered in 1875 1^7 Lecoq de Boisbaudran in a zinc-blende. Hard white metal, malleable and ductile. Sp. gr. 5.9. Melts at 30''. i C. Heated to redness, it only oxydizes upon the surface, and does not volatilize. Gallium oxide GaoOj is soluble in HOK, and Gallium is obtained by electrolysi.s of this solution. Gallium oxide substitutes Alumina in alum. Gallium hydroxide is white and soluble in excess. Gallivm CHLORIDE Cl3Ga is deliquescent. Gallium sulphide SjGa; is white, and precipitated from its salts by SHHjN. Gallium gives a bright spectrum, exhibiting a brilliant line and a fainter band in the violet. ' Watts' Chemistiy.'] [XL. Indium In = 113.4. Never native. A triad. Discovered in 1863 by Eeich and Eichter in the zinc-blende of Freiberg. Silver-white metal, malleable and ductile. Sp. gr. 7.421. Melts at 176° C. Less volatile than Cadmium. Heated to redness it bums with violet llame In203. Chloride ClaIn, volatile. Sluphide SjLu is yellow. Precipitated from neutral solutions by SH,. Indii'ii oxiDK In^Oj yellow; Hydroxide is white, soluble in HOK, in- soluble in HjiST. Zn and Cd precipitate Indium. Two indigo-colored lines, in the spectrum: one very bright ami more refrangible than the blue line of Sr, the other fainter and still more refrangible, and approaching the blue line of Potassium. ' Watts.'] Symb. At. weight. Sp. gr. Fusinf?-point. Argentum . Ag = 108.0 . 10.53 . 916°. C. Hydrargyrum . Hg = 200.0 . 13.59 38.8 C. Aurum . Au = 196.6 . 19.34 . 1037°. C. Platinum . . Pt = 197.1 . 21.53 . 1460^ C. Palladium . Pd = 106.5 . 11.80 . 1360°. C. Ehodium . Eo = 104.3 . 12.10 Ruthenium . . Ru = 104.2 . 11.40' Osmium . . Os = 199.0 . 21.40' Iridium . . Ir = 198.0 . 21.15 XLI. Argentum or Silver Ag = 108. Monad metal, frequently native, both crj'stallized and massive. The whitest and most lustrous of the metals. The best con- ductor of heat and electricity. Sp, gr. 10.53. Melts at 916° C. A noble metal; does not tarnish in piue air, and its oxide is