Experimental Chemistry for Junior Students; Non-Metals. 5th Ed. 1888 Volume 2
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. 1888 edition. Excerpt: ...as mere mechanical filters. Their special power may, however, be restored by placing the filter, dry, in an iron vessel covered with dry sand and then heating to redness, out of contact with the air. When cold, the filter may be removed from the sand, washed, and used at once for water-filtration. Experiment 228.--Arrange the apparatus shown in fig. 92; t is a tube of hard glass, about 35 cms. long and rather more than 1 cm. diameter; it is L connected at the end 0 by means of a flexible tube with a gas-holder, bag, or flask capable of supplying a stream of oxygen. The end e is provided with a cork and delivery tube, as indicated, and should dip into a jar or bottle containing some clear lime-water. Introduce into the tube a few pieces of wood or animal charcoal, c, and apply heat to that portion of the tube on which the carbon rests, and pass a gentle stream of oxygen through the apparatus. First note that when the pure oxygen is made to bubble through the lime-water, the latter remains clear; but soon the charcoal begins to burn in the gas, as in Experiment 58, and the issuing gas then renders the lime-water milky. We have already learned, from the experiment just referred to, that lime-water is a convenient test for the gas, which is carbon dioxide, and is always produced when carbon burns in excess of air or oxygen--C + 2o = ccv Experiment 229.--Use the same arrangement in a corresponding experiment with plumbago, and note that even when the latter is very finely powdered and heated very strongly, only a small quantity of carbon dioxide is produced; if, however, we mix the plumbago with twice its weight of any body rich in oxygen--for example, potassium chlorate--and then heat sufficiently, combustion takes place, and much carbon dioxide is...
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