Verwandte Artikel zu Exercises in practical chemistry, by A.G.V. Harcourt...
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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. 1869 Excerpt: ...a little hydrogen chloride to a dilute solution of sodium silicate, and evaporate to complete dryness. Pour on the white residue some dilute hydrogen chloride, warm it, and notice that the silicon dioxide, which is formed, remains completely undissolved. Decant the solution, dry the residue, and heat a small portion of it with a bead of sodium ammonium and hydrogen phosphate, made in the same way as a borax bead, p. 135. The residue will float in the melted bead, without dissolving or altering in appearance. Another portion may be tested by fusion with sodium carbonate in a loop of platinum wire, p. 137, when a globule of clear glass will be obtained. The student is recommended, before passing on to the study of the different metals, to refer to the account of the course of analysis given at the commencement of Part II, and to practise himself in the analysis of single salts containing some one of the foregoing non-metallic radicles associated with an alkali-metal. ARSEiaC. 1. Place a little arsenic trioxide in a small dry test-tube, and heat it over a lamp; the substance will volatilise completely, and form a ring of crystals, often iridescent, in the cool part of the tube. Examine these crystals with a magnifier; they will be found to be octohedra, with a square base. 2. Mix a small quantity of arsenic trioxide with an equal quantity of sodium carbonate and the same amount of potassium cyanide. Place the finely-powdered and dried mixture in a small tube of hard glass about 5 cm. long, having a bulb blown at one end (for the method of making these tubes, see p. 37), and wipe off any adhering particles of the mixture from the sides of the tube with a twisted strip of filter-paper. Heat the bulb, gently at first, over the lamp, and absorb any moisture which ...
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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. 1869 Excerpt: ...a little hydrogen chloride to a dilute solution of sodium silicate, and evaporate to complete dryness. Pour on the white residue some dilute hydrogen chloride, warm it, and notice that the silicon dioxide, which is formed, remains completely undissolved. Decant the solution, dry the residue, and heat a small portion of it with a bead of sodium ammonium and hydrogen phosphate, made in the same way as a borax bead, p. 135. The residue will float in the melted bead, without dissolving or altering in appearance. Another portion may be tested by fusion with sodium carbonate in a loop of platinum wire, p. 137, when a globule of clear glass will be obtained. The student is recommended, before passing on to the study of the different metals, to refer to the account of the course of analysis given at the commencement of Part II, and to practise himself in the analysis of single salts containing some one of the foregoing non-metallic radicles associated with an alkali-metal. ARSEiaC. 1. Place a little arsenic trioxide in a small dry test-tube, and heat it over a lamp; the substance will volatilise completely, and form a ring of crystals, often iridescent, in the cool part of the tube. Examine these crystals with a magnifier; they will be found to be octohedra, with a square base. 2. Mix a small quantity of arsenic trioxide with an equal quantity of sodium carbonate and the same amount of potassium cyanide. Place the finely-powdered and dried mixture in a small tube of hard glass about 5 cm. long, having a bulb blown at one end (for the method of making these tubes, see p. 37), and wipe off any adhering particles of the mixture from the sides of the tube with a twisted strip of filter-paper. Heat the bulb, gently at first, over the lamp, and absorb any moisture which ...
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