Synopsis
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. 1900 Excerpt: ...the watch-glass of a balance or by weighing with the crucible. The weight of the barium sulphate, less the known weight of the ash of the filter paper, multiplied by 0.13734, will be the weight of the sulphur present in the amount of the substance taken. 251. When silica is not present, the evaporation of the filtrate from the solution of the fusion can be omitted, which will greatly shorten the method. When evaporating to dryness, care must be taken on account of the fact that if it is done too rapidly some of the material is liable to be lost by spurting. PREPARATION OF REAGENTS. 252. The following table of proportions for the preparation of reagents may be found useful. The concentrated acids have not been included in the table on account of the fact that they are used as received from the supply houses. Dilute hydrochloric j One portion of HCl to 8 portions of acid (HCl). ( water by volume. Dilute nitric acid I One portion of concentrated HNO, to (NffOt). ( 8 portions of water by volume. One volume of concentrated nitric acid added to 3 volumes of hydrochloric acid forms aqua regia, which should be prepared only as required. It may be used either concentrated or dilute. This is formed by treating iron sulphide (FeS) with sulphuric acid. If iron sulphide can not be obtained, it may be prepared by fusing iron nails with sulphur, in the proportion of about 1 part by weight of iron to 2 parts by weight of sulphur. fftS gas may be led into water until the water is saturated and the saturated water used as a reagent. The water should be kept in colored-glass bottles, as it is quickly decomposed when exposed to the light. When it is desired to precipitate any substance from the solution by means of H,S, it will be better to conduct the gas itself into the solu...
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