A System of Instruction in Quantitative Chemical Analysis

Paperback | January 11, 2012

byC. Remigius Fresenius

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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1871. Not illustrated. Excerpt: ... tained in a substance is, therefore, one of the most important, as well as most frequently occurring operations of quantitative analysis. The proportion of water contained in a substance may be determined in two ways, viz., a, from the diminution of weight consequent upon the expulsion of the water; b, by weighing the amount of water expelled. § 35. a. Estimation Of The Water From The Loss Of Weight. This method, on account of its simplicity, is most frequently employed. The modus operandi depends upon the nature of the substance under examination. o. The Substance bears ignition williout losing oilier Constituents besides Water, and without absorbing Oxygen. The substance is weighed in a platinum or porcelain crucible, and placed over the gas or spirit lamp; the heat should be very gentle at first, and gradually increased. When the crucible has been maintained some time at a red heat, it is allowed to cool a little, put still warm under the desiccator, and finally weighed when cold. The ignition is then repeated, and the weight again ascertained. If no further diminution of weight has taken place, the process is at an end, the desired object being fully attained. But if the weight is less than after the first heating, the operation must be repeated until the weight remains constant. In the case of silicates, the heat must be raised to a very high degree, since many of them (e.g. talc, steatite, nephrite) only begin at a red heat to give off water, and require a yellow heat for the complete expulsion of that constituent. (Tn. Scheerer.*) Such bodies are therefore ignited over a blast lamp. In the case of substances that have a tendency to puff off, or to spirt, a small flask or retort may sometimes be advantageously substituted for the crucible. Care must b...

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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1871. Not illustrated. Excerpt: ... tained in a substance is, therefore, one of the most important, as well as most frequently occurring operations of quantitative analy...

Format:PaperbackDimensions:290 pages, 9.69 × 7.44 × 0.61 inPublished:January 11, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217435769

ISBN - 13:9780217435765

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