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.

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    aramoniaHjlSr. p. 8. H3N unites witli many metallic salts. Thus with: CIA2;,2H3N. ClXa.GHjN. Cl^CaBHjX. SO.,(02Cu),4H3N, OH,. NOoCOAgXjHjN. When II3N and dry CO., are brought together, we obtain AMMONIUM carbamate COXHjCOHjN). Car- BAMic ACID CONHjCOH), has not been isolated. One atom of amidogen H,N displaces i atom of OH. So-called carbamide CO(jSI Hj), would be formed by substituting NH, for OH, and this iiappeus when ammonia and carbon-oxychloride COCI2 are bi'ought together. Ammonium sulphamate SO-.NH^OHjN, results, wlien SO3 and 2H3N are brought together. With acids, it is different: we have salts of ammonium. Ammonium hydrogen SULPHIDE SH(H.,N) is the common test for the metals, precipi- tating in neutral solutions, black sulphides of feiTous, cobalt and nickel, white zinc sulphide and aluminum hydroxide, flesh- colored manganous sulphide, and greenish chromium hydroxide. Prej). bv saturating H3N with SH,. Absorbs 0 and becomes yellow disulphide S^^H^N),. Thus.' 8SH(HjN) + sO, = 4OH, + 2[S2(H,N).,] + 2[S,0(OH,N)2]. Dissolves as sulphur salts the electronegative sulphides; with evolution of SHj. Asi- MONiUM chloride CIH4N = 5 3 .5 = 4 vols. Or H3NCIH. Semi- transparent, tough, fibrous. In cubes, octahedra or fern-shaped. Soluble in less than 3 parts of water. Iodide I(H,N'). Nitrate NOjOCH^N). source of N„0 at 250° C. and of 2OH.,. Striated prisms. Nitrite NO(OHjN); by heat into 2OH2 and N,. Sulphate SO.XOH^N)^, in prisms, soluble in two of cold water. Carbonate COCOH^N),. Sesquicarbonate op ammonium 2[C0(0H4N)2],C02. Smelling-salts. Bylossof ammonium car- bamate COIl2N(OH4N), into ammonium hydrogen carbonate CO(OH)(OH,N) (two molecules). Prep, by subliming am- monium chloride with calcium carbonate : GClHjN-f 3C0(0.,Ca) = 3Cl,Ca -1- OH., -1- 2H3N + sesquicarbonate. Ammoniuni sodium hydroxyl phosphate P0(0H)(0H,N)(0Na),40H„ is ini- crocosmic salt. Insoluble salt. Ammonium platinic chloride 201HjN,Cl4Pt, yeUow powder; contaius 7.62 per cent, of H3N. Metals of the alkaline earths. Symbol. At. weight. Sp. gr. Barium . . Ba = 137 . . 4.000 Strontium . Sr = 87.5 . . 2 540 Calcium . . Ca = 40 . .1.578 Dynd metals which decompose water at ordinary temperatures. Their oxides are strongly basic, alkaline, soluble as hydroxides. Carbimates insoluble in water; bi-carlxmates are soluble. Most of their salts are insoluble in water. In solution, they can be separated from the alkalies by boiling with ammonium carbonate.