A Manual of Practical Assaying

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John Wiley & Sons, 1893 - Assaying - 463 pages
 

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Page 33 - In Closed Tube with Dry Soda and Magnesium. — The soda and substance are mixed in equal parts and dried, and made to cover the magnesium. Upon strongly heating there will be a vivid incandescence, and the resulting mass, crushed and moistened, will yield the odor of phosphuretted hydrogen. POTASSIUM, K. Flame. — Violet, except borates and phosphates.
Page 32 - Then, if dissolved in the acid and heated with metallic tin, zinc, or copper, the solutions will be successively blue, green, and brown. If the S.Ph.
Page 37 - Ph.—OF Clear and colorless. RF Greenish hot, blue cold. On long blowing or with tin on coal becomes dark green. With Dilute HCl. — If insoluble, the substance may first be fused with S. Ph. The solution heated with tin becomes dark blue ; with zinc it becomes purple and then reddish brown. INTERFERING ELEMENTS.
Page 26 - With Nitric Acid. — Heat with water and then with dilute acid ; CO, will be set free with effervescence. The escaping gas will render lime-water turbid. With Borax or S. Ph. — After the flux has been fused to a clear bead, the addition of a carbonate will cause effervescence during further fusion. Chlorine, Cl. With S. Ph., saturated with CuO.— Treated at tip of blue flame the bead will be surrounded by an intense azure-blue flame. On Coal, with CuO.
Page 330 - Ib. According to Boyle's law, the volume of a gas varies inversely as the pressure affecting it so long as the temperature remains constant; consequently in doubling or trebling the pressure the volume becomes one-half or onethird respectively. According to Charles...
Page 268 - K and /,, which have been previously supplied. When the water rises in the funnel M, and all air-bubbles have been forced out of the tubes, the stop-cocks F and G are closed, the funnel M is removed, and the tube delivering the gas to be tested is attached in its place.
Page 25 - Dark brown coat, greenish yellow in thin layers. Beyond the coat, at first part of operation, the coal shows a variegated tarnish. On Smoked Plaster with Bismuth Flux. — White coat made orange by (NHt)3S.
Page 37 - If then dissolved in the acid and heated with metallic tin, zinc or copper, the solutions will be successively blue, green and brown. If the S. Ph. bead has been treated in RF the solution will become brown.
Page 22 - The details in ordinary manipulations, such as obtaining beads, flames, coatings, and sublimates, are omitted, and the results alone stated. Unusual manipulations are described. The bead tests are supposed to be obtained with oxides ; the other tests are in general true of all compounds not expressly excluded. The course to be followed in the case of interfering elements is briefly stated. Aluminium, Al. With Soda. — Swells and forms an infusible compound. With Borax or S. Ph. — Clear or cloudy,...
Page 33 - Saturate two or three borax beads with roasted substance, and treat on coal with strong RF If a visible button results, separate it from the borax and treat with S. Ph. in the OF, replacing the S. Ph. when a color is obtained. If no visible button results, add either a small gold button or a few grains of test-lead. Continue the reduction, and — With Gold. — Treat the gold alloy on coal with S. Ph. in strong OF With Lead.

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