Notes on analytical chemistry : for students in medicine / by Albert J. Bernays.
- Albert Bernays
- Date:
- 1886
Licence: Public Domain Mark
Credit: Notes on analytical chemistry : for students in medicine / by Albert J. Bernays. Source: Wellcome Collection.
39/160 page 29
![KOH blue basic salt precipitated, turning green on exposure; into pale-red hydroxide CoH^O.^, on boiling. NH4OH, blue basic salt, readily soluble in excess, with greenish color, browning on exposure; ultimately red. (NHJ.^COs, peach-colored basic carbonate, readily soluble in excess with magenta color. K^FeCyg, greenish precipitate. K;,FeCy,;, brownish-red precipitate. [On addition of tartaric acid to a fresh sample, then of ammonia, and then of fcrricyanide of potassiimi, a deep yellowish-red color ensues. Thus may cobalt be detected in presence of nickel]. [KNO2, together with acetic acid, yields after a time a bright yellow precipitate of cobalt—potassium nitrite.] [KCy, brownish-white GoCy.^, easily soluble in excess as 2KCy, CoCy.,, and precipitated by HCl; not precipitated after boiling, as cobalticyanide of potassium, KjCoCyg is formed.] [Ca02ClO gives a black precipitate of cobaltic hydrato COoOq, 3H,0.] On charcoal similar to iron, but more metallic. Borax bead colored blue in outer and inner flame. 23. Nickel, Ni = 58-6. ' Silvery, faint yellow tinge. Dilute nitric acid a ready solvent, to nickel nitrate. Coucentrated HNO, renders it passive. Dilute hydrochloric and sulphuric acids slowly dissolve it. Kupfer nickel, Ni^S.^, is its chief ore. Arsenical nickel, NiAso, is also an ore. The metal obtained from the oxide by strongly heating with carbon ; or from the oxalate NiC^O^ by heat. Nickel oxide is grey; hydroxide, imripe apple-green. Soluble salts are green, and redden litmus. Chief salts: NiCljfOHjO ; NiS04,7H20; Ni2NO^,6H20. Sodium carbonate precipitates green basic carbonate HCl + HjS no reaction; separation of cupric, &c. NH^Cl+NH^OH, a plum-colored liquid, so that nickel is detected in Group III. Tests for nickel in soluble salts. IV. NH.Cl + (NHJ2S, black sulphide NiS,H,A giving brown coloration to liquid, as slightly soluble. With diflBculty soluble in HCl; easily in HNO3 and in aqua regia. KOH, apple-green hydroxide NiHaOa; insoluble. NH^OH, greenish turbidity, soluble in excess with plum color; no precipitate in free acids, or in presence of ammonium salts. (NHJ^COs, green basic carbonate, readily soluble to greenish-blue fluid. K^FeCys, greenish-white Ni2FeCyfi. KgFeCye, yellowish-brown precipitate. KCN, yellowish-green NiCy2, soluble with brownish-yellow color, in excess, as 2KCy,NiCy2, and re-precipitated as NiCyj by acids. On charcoal, nickel is found as are iron and cobalt Borax bead, in outer flame, reddish-yellow while hot; paler on cooling ; in inner, grey. '](https://iiif.wellcomecollection.org/image/b21499056_0039.jp2/full/800%2C/0/default.jpg)
