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. 1870 Excerpt: ... Carbonates which dissolve freely in colddilute acid. In the processes hitherto described, carbonic acid is determined by the loss of weight of anapparatus which contains no carbonic acid gas at the beginning and which must be completely emptied of this gas at the conclusion of the analysis. It is a matter 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. 1870 Excerpt: ... Carbonates which dissolve freely in colddilute acid. In the processes hitherto described, carbonic acid is determined by the loss of weight of anapparatus which contains no carbonic acid gas at the beginning and which must be completely emptied of this gas at the conclusion of the analysis. It is a matter of experience, however, that accurate results are not attainable with certainty in this way. Nothing short of actual boiling for some time will expel all carbonic acid gas from the dilute acid liquid. This cannot be done conveniently without loss of aqueous vapor. The fact that good results are often obtained is due to the compensation of opposite errors, as the analyst may convince himself by repeatedly heating and sucking through air. If the suction go on to just the right extent, the loss of the apparatus will exactly correspond to the carbonic acid that was contained in the substance, but further exhaustion of the air will diminish the weight of the apparatus, not by complete removal of the carbonic acid, but by loss of aqueous vapor, which easily escapes the desiccating material. By continued working on a carbonate of known composition one may soon learn how long to exhaust in order to bring out the proper loss, but where the analyst is Dingler's poL Joura. 184, 128. f American Journal of Science and Arts, Vol. xlviii., July, 1869. out of practice, an error of 1 to 2 per cent, is not unlikely to happen, and the process itself furnishes no means of judging when it will give a correct result. The editor employs a simple modification of this method, which, tinder proper conditions, gives very accurate results and furnishes to a great extent its own control. The process is novel in this particular, viz.: the charged apparatus is in the first place filled...
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New York 1894 "seventh thousand-from the last English and German editions." John Wiley. 883p. Fairly Good, inner hinges repaired; binding secure. cover has some wear. no owner marks.
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