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. 1872 Excerpt: ...The alloy is divided up as much as possible, then intimately mixed with five times its weight of carbonate of soda and five of sulphur; the mixture is then melted at a low heat over the lamp. As soon as it begins to flow gently, it is kept ignited for some time. When cool the mass, consisting of the double sulphide of ...
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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. 1872 Excerpt: ...The alloy is divided up as much as possible, then intimately mixed with five times its weight of carbonate of soda and five of sulphur; the mixture is then melted at a low heat over the lamp. As soon as it begins to flow gently, it is kept ignited for some time. When cool the mass, consisting of the double sulphide of arsenic and sodium and the double sulphide of tin and sodium, is completely dissolved in water (traces of electro-positive metallic sulphides, for instance of iron, copper, lead, remain undissolved); the solution is highly diluted, then hydrochloric acid is added in excess; and the mixture is kept digesting at a very gentle heat, until all smell of hydrosulphuric acid has passed off. The sulphides of tin and arsenic, that have separated, are collected on a weighed filter, washed thoroughly with cold water, containing a few drops of acid, dried in the air, then in the drying apparatus at a temperature of boiling water, until their weight remains constant... /.., S.. V A part of the dried sulphides is placed in a weighed bulbtube, as already described for the analysis of metallic sulphides by means of chlorine, page 88; the remaining part, together with the filter, is again dried in order to ascertain the quantity in the bulb. The wider tube attached to the bulb is bent at an obtuse angle and dips just below the surface of a quantity of ammonia placed in a two-necked Woulfe's bottle. The narrow tube of the bulb is connected with an arrangement through which dried hydrosulphuric acid is generated and passed. As soon as the whole arrangement is filled with gas, the bulb is heated, as also the wider tube, by which the sulphide of arsenic is driven forward into the ammonia. As soon as there is no longer any formation of the yellow sulphide of arseni...
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Add this copy of Guide to a Course of Quantitative Chemical Analysis to cart. $65.41, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.
