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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    by (0]I).,Ca. The reduction of the oxido by carbon is sufficiently simple. The separation is also effected by converting Co into potassium cobalti-cyanide and precipitating nickel cyanide (CN).,Ni by CIH. One basic oxide. Nickel oxide NiO = 74.8. Olive-green. By igniting tiie carbonate out of contact of air, Hydi-oxide (OH)„Ni, bulky light-green. Forms insoluble com- pounds with HOK, HONa, (HOXBa, (HO).,Sr. H3N dissolves it to a blue solution. Salts are green. Nickel peroxide Ni^Oj is black. Hydrate (OH)cNi„. Not basic. Thus: 2(0H)2Ni + CL -I- 2HOK = 2KCI + (0H)„Ni2. — Nickel sulphide WNi = 9o'8, native as Millerite. As black hydrated sulphide {OH„)SNi, from solutions of nickel salts by SHH.N. Sub- sulphide SNi,. Bisulphide SjNi. Soluble salts of nickel. Chlokide CloNi.gOI-Io is green. Sulphate SO.,Ni,70H2, green rhombic prisms, isomorphous with S04Mg,70H2, S04Zi),70H2, SO^MnjOH., and S04Fe,70H„. Soluble in 3 parts of water. Nitrate (Nb.)„02Ni. Insoluble salts. Carbonate of nickel 3[CO(0„Ni)],20Ho.' Basic carbonate always precipitated. Nickel cyanide CjNjNi, apple-green. The nickel salts impart a reddish-yellow color to the borax bead. Nickel is estimated as NiO, containing 78.67 per cent, of Ni. XXIII, Chromium Cr = 52.2. A pseudo-triad metal in its chromic salts. Never native. Discovered by Vauquelin in 1797. Steel-grey. More intract- able than Platinum, Sp, gr. 6.8r. Insoluble, even in aqua regia. Prep. By strong ignition of Cr„03 with Charcoal, in a wind-furnace. Or, by passing the vapor of sodium over red- hot chromium chloride : Glfir^ + sNa^ = 6ClNa -|- Cr^. Two basic oxides, and one intermediate, i. Chromous oxide CrO, only known as hydroxide (OH)„Cr, Brown, whicli absorbs O and becomes hydrate of Chromous-chromic oxide CrOjCrjOj.aq, Powerful base : forms chromous salts of pale-blue color, which absorb 0, 2. Chromic oxide, Cr^Oj = 152,4, Green, iso- morphous with AI2O3, Mn^Oj, FCjOg and substitutes AljOj in alums. Coloring-matter of the emerald, chlorite, pyrope, ser- pentine, cScc, Employed as a green color for porcelain and glass. As hydroxide (OH)„Cr2,4aq. of liglit-blue color. Salts green and uncrystallizable; violet and crystallizable. Prep. By beating ammonium ohromate CrO.,(NU.,)2- Or, crystalline, by heating potassium dicliromate, Chrome iron- ore or Ferrous-chromic oxide FeO.CrjO.,, is tlie chief ore of chromium, con-espoiiding to magnetic o.xidc of iron, CrjO,, displacing FojOj, In octahcdra and massive. 3, Chromic anhydride CrOj, in brilliant, dark-crimson, deliquescent prisms.