Volume 1

Fownes' manual of chemistry : theoretical and practical / [George Fownes].

  • Fownes, George, 1815-1849.
Date:
1877
Catalogue details

Licence: Public Domain Mark

Credit: Fownes' manual of chemistry : theoretical and practical / [George Fownes]. Source: Wellcome Collection.

    534/586 (page 516)
    solves readily in dilute acids, even in acetic acid, and forms a large number of crystallisable salts, botb neutral and acid, having a yellow colour, and sparingly soluble in water. Another compound of pla- tinic oxide with ammonia, c£i\led fulminating platinv/m, whose com- position has not been exactly ascertained, is produced by decomposing ammonium platino-chloride with aqueous potash. It is a straw- coloured powder, which detonates slightly when suddenly heated, but strongly when exposed to a gradually increasing heat. 6. Platinosemidiammonium Gompoxmds.— Isomeric with the precedmg. The chloride, Cl2Pt<;[^^2H6Cl ^ ^^^^^^ ^he action of chlorine on platososemidiammonium chloride, crystallises in yellow six-sided plates belonging to the rhombic system, turning green at 100°, and dissolving in potash without evolution of ammonia. A basic nitrate, (0H)2Pt <^q|^6 ^ obtained as an amorphous yeUow precipitate by treating the chloride with silver nitrate. A cMoronitrate, Cl2Pt^^^''''^^2 ^ obtained by the action of chlorine on platososemidiammonium nitrate, crystallises in small yellow needles. 7. Platinomonodiammonium Compounds.—The chloride, ClgPt <^jjg'^(]j^ J formed by the action of nitromuriatic acid on plato- somonodiammonium chloride, crystallises in rhombic or hexagonal plates. A bromonitrate, Br2Pt<^^^6(^3) + H20 , obtained by adding bromine to the nitrate of platosomonodiammonium, forms yellow soluble crusts. 8. Platinodiammonium Compounds. — The chloride PtCl2<^^2^''Qj, is obtained by passing chlorine gas into a solution of platosodiammonium chloride ; by dissolving platinammonium chloride in ammonia, and expelling the excess of ammonia by evaporation ; or by precipitating a solution of platinodiammonium oxynitrate, or nitrato-chloride, with hydrochloric acid. It is white, and dissolves in smaU quantity in boiling water, from which solu- tion it is deposited in the form of transparent regular octohedrons, having a fault yeUow tint. When a solution of this salt is treated with silver nitrate, one-haK of the chlorine is very easily precipitated, but to remove even a small portion of the remainder requu-es a long-continued action of the silver-salt. The chlorobromddc, ^^p>Pt^-j^2^c^^ ^ ig obtained as a yellow precipitate by treat- ing platinodiammonium chloride with bromine. A basic nitrate, NO /^-^^'Cn^h'^'no'' ' o^t^i^sd by the action of nitric acid on platosodiammonium nitrate, as a white crystalline powder, converted by ammonia into the salt (HO)2Pt(N2HB.N03)2. The sulphato-