Items related to A system of theoretical and practical chemistry Volume...
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1803 Excerpt: ...ether, be immersed in the nitro-muriatic solution, its surface is immediately gilt with a fine coat of gold, which adheres very strongly. That phosphorated hidrogen gas produces the same effect has been noticed already, (vol. i. p. 276). Sulphureous acid gas has a similar effect. Remark...Mrs. Fulhame has proved that the presence of moisture is absolutely necessary for the reduction of gold. It is difficult.to ascertain what makes water so indispensably necessary. It is not, as might be supposed, requisite to secure the fluidity of the mixture; for she has ascertained that sulphuric ether, though a fluid, does not answer, except water be present. She accounts very ingeniously for the phenomena, by supposing the water to be decomposed. The combustible combines with its oxigen, while its hidrogen unites to the oxigen of the gold, and re-produces water. This theory accounts very well for the phenomena; but it would require some direct proofs to establish it completely. Expebiment VI. Decomposition of nitro-muriate of gold by ammonia. (Preparation of fulminating gold.) Dissolve pure gold in nitro-muriatic acid to saturation, and dilute the solution with three times its bulk of distilled water, and add to it gradually some pure ammonia, a yellow precipitate L 4 In her Essay on Combustion. will be obtained, which must be repeatedly washed with distilled water, and dried on a chalk stone or in a filter. When perfectly dry it is called fulminating gold, and detonates by heat as may be shown by heating a few grains of it on the point of a knife held over the candle. Rationale...Though the theory of fulminating gold is not yet sufficiently illustrated, it appears highly probable that it is a triple compound; namely, an ammoniacul oxi-mwriate of gold. We suppose there...
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