This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1871 edition. Excerpt: ...oxide gas is given off: --CaCO., + C = CaO + 2CO. It should be mentioned, however, that in all these cases the carbonie oxide obtained is more or less contaminated with carbonic acid, portions of which escape reduction by the metal and carbon; the carbonic acid may always be readily removed by causing ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1871 edition. Excerpt: ...oxide gas is given off: --CaCO., + C = CaO + 2CO. It should be mentioned, however, that in all these cases the carbonie oxide obtained is more or less contaminated with carbonic acid, portions of which escape reduction by the metal and carbon; the carbonic acid may always be readily removed by causing the gas to pass through a strong solution of caustic soda or through a U-tube filled with bits of pumice-stone saturated with soda-lye. Carbonic oxide can be obtained also by heating charcoal with other solid oxygen compounds, such as the phosphate of calcium, already mentioned ( 270), or the oxides of almost any of the metals, provided the charcoal be in excess. Exp. 183.--Heat in an ignition-tube, as before, a mixture of 1 gnu of finely-powdered charcoal and 8 grms. of red oxide of iron; collect the gas over water, pour into the bottle a little soda-lye, close the mouth of the bottle tightly and shake it, then open the mouth of the bottle under water, and finally test the gas with a lighted match. 416. Another easy method of preparing carbonic oxide is to decompose oxalic acid by means of oil of vitriol; this is the method usually employed in the laboratory. Oxalic acid is j solid vegetable acid, to be procured of the druggists; its composition may be represented by the formula HaCaO4. On being heated with concentrated sulphuric acid, it suffers decomposition in a manner which may be formulated as follows: --HaO, CaO, + HaO, SO, = 2H,0, SO, + CO + CO, .--J The elements of water are taken away from the oxalic acid and united with the sulphuric acid, while the remainder of the oxalic acid breaks up into carbonic acid and carbonic oxide. Exp. 184.--Place in a flask of about 850 c. c. capacity 9 grms of common oxalic acid and 53 _. grms.
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