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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![VI. IF BLUE. Probably indigo, Prussian blue, ultramarine, cob;ilt-l)lue and many insoluble cupric salts. changed by HoSO^, or by cold potassium hydroxide. On ])latinum, when heated, purple vapors of the pure substance are evolved, and it burns leaving but little ash. Prussian blue is turned white by HoSOf evolving prussic acid (p. 88). Heated with potassium hydroxide into brown ferric hydroxide (p. 109), and solution of potassium ferroeyanide (p. 47). On platinum, heated, a copious ash of ferric oxide. Insoluble cupric salts dissolve easily in HCl with blue or green color. Azurite dissolves with effervescence, as it is a carbonate (p. 22). VII. IF WHITE, OR NEARLY WHITE. Names are legion. of mercury, lead, silver, bismuth and stannous. Orange or yellow, soluble in excess, antimonous and stannic. Calomel, Hg.,CL, completely volatile. Blackened by ammonic hydrate; the solution decanted, gives, with nitric acid and silver nitrate, the characteristic reaction of a chloride (p. 45). Boiled with copper and dilute nitric acid, silvery coating of mercury. Strong hydrochloric acid dissolves mercuric chloride and leaves mercury. Aqua regia dissolves mercurous as mercuric chloride. Absence of mercuric chloride in mercurous: boil with water, decant and add lime-water: if a yellow pr., mercuric present. Lead hydroxide, PbHaO,, unchanged by ammonia. Dissolves as lead chloride in HCl to PbClj, which may crystallize out in shining needles. On platinum fuses to yellow oxide. Gives beads of lead, with yellow incrustation, heated on charcoal (p. 15). Lead hydrocarbonate, PbCOs.PbH.O^; white lead. Dis- solves with effervescence in HCl, or better in HNO3, as a salt of lead, with only the radicle employed (p. 15). Lead sulphate, PbSO^, also unchanged by ammonia. Strong HCl dissolves sufficient to give white pr. with barium nitrate, proving sulphate (p. 40). Fused on charcoal with NaaCOs, beads of lead, with yellow incrustration; the beads, washed and dissolved in HNO„ give the reactions of lead nitrate; the mass moistened on a silver coin, give the browning or blackening of a sulphide (p. 36), and the odor of H.^S. Silver chloride, AgCl. Dissolved by ammonia, and re-preci- pitated by nitric acid. Insoluble in acids. Fuses on platinum: horn-silver. Fused on charcoal with Na2C03: beads of silver and a mass containing sodium chloride. Dissolve the washed beads in nitric acid, and confirm silver (p. 16), and test for chloride in the dissolved sodium carbonate and chloride (p. 45). Silver cyanide, AgCN. Dissolved by ammonia. With coppery lustre. It is un-](https://iiif.wellcomecollection.org/image/b21499056_0121.jp2/full/800%2C/0/default.jpg)
