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. 1906 Excerpt: ... when a known weight of chalk is acted upon by hydrochloric acid. This experiment is easily done if a small flask be weighed and about-5 gram of powdered calcium carbonate put in the flask, which is reweighed. The flask is now fitted with an indiarubber cork having two holes through which pass a tube bent at right angles and a drying tube containing calcium chloride respectively. The rightangled tube must be closed by a piece of indiarubber tubing fitted with a clamp. The cork is now removed and two small test-tubes containing concentrated hydrochloric acid are suspended by means of fine cotton in the flask, the chalk having been previously covered with distilled water. The cork is then refitted, care being taken to keep the tubes containing the acid upright. The whole apparatus is then reweighed, after which the acid in the test-tubes is upset on the chalk. When all the chalk has dissolved the clamp is removed from the piece of indiarubber tubing and air drawn through the apparatus by means of an aspirator. The clamp is then replaced and the whole apparatus reweighed. The difference between the second and third weighings gives the weight of carbonic acid gas given off, and from this the percentage loss of weight can be calculated. This should be 44 per cent. The class can next try to find the weight of a litre of carbonic acid gas. This can be done by fitting up an apparatus similar to that shown in Fig. 24. The calcium carbonate is placed in the flask with a little distilled water and the test-tubes are filled with concentrated hydrochloric acid and suspended in the flask, which together with the drying tube is then weighed. The drying tube is then connected to the Winchester, the acid is upset over the chalk and the clamp connecting the Winchester with t...

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