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.
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![cyanides being notable exceptions. Load and mercnric iodides give colorless solutions, so also do many other bodies in dissolving in acids. The deep blue tint of aminonio-cupric solutions is re- moved by potassium cyanide. The color of precipitates often vanes with dilferent circumstances of precipitation. Fluorescent bodies. Quina salts in solution [chlorophyll fBscuiiu, eosin, paratiin oil, uranium compounds]. Substances more or less dichroic. Some salts of chromic oxule, potassium tiirricyanide, platino-cyanides, nick-el liydroxide m ammonia, [most aniline dyes, indigo,] PrussicUi blue, potassium permanganate crystals. Trr^r^STf^^fr^^^T^^^.r^^^^^- ^^2' SO,,, H.,S, [HoSe, H^Te], HCl, 1 Hr HI HCN (CN),„ HF, NO.NH,; PH; (stinking ish). As and ASH3 (garlic); C1,0 (from hypochlorites); acetic, formic, ana benzoic acids; burnt sugar (sugars and tai-taric acid, on neatmg); Inirnt ieathors (protein compounds by heat); plea^sant ethereal (acetic and formic ethei-s, from acetates and formates by heating with alcohol and K,SO,); aJdehyd (from alcohol'by Aobr.u^ and H..,bO^); alcohol (nearly inodorous when pure), ether clUorotorm, CS„ and a large number of organic compounds- acrolein (intensely pungent, from glycerin by KHSO, and heat) benzoic, citric and succinic acids by 11. THE SUBSTANCE IS nSTSOLUBLE IN WATER (See p. 10.) If the substance is insoluble in water, it is boiled with strong HC? The following gases may be evolved : CO^ from a carbonate; H,S from a sulphide; SO, from a sulphite, or thiosulphate; Hck from a cyanide; CI, from a peroxide, or chromate (turns green)- knl'IfTllfS'^ iodate; Br, (orange) from a bromate! Many silicates gelatinize; m such case, evaporate to dryness igni e gently, and re-dissolve in HCl; SiO, remains behind as a chbrides'' ^ ^^^^^ 1'^^ a« If the main part of the substance ha.s dissolved, filter or decant boil off any large excess of HCl, dilute with a little water and proceed with the use of Group-tests as given at pp. 11 and 12 JS.B. If crystals form in the solution on cooling, e.g. arsenious boracic, benzoic, hippunc uric, and gallic acids, leid chlorTdo wifh&cStS^TiotS^^^^ A turbidity, on dilution, indicates Sb or Bi If the solution gives a precipitate with NH^'ci + NH^OH, a phos-](https://iiif.wellcomecollection.org/image/b21499056_0069.jp2/full/800%2C/0/default.jpg)
