A Manual of Qualitative Chemical Analysis

Paperback | October 12, 2012

byJoseph Frank Mcgregory

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 edition. Excerpt: ...acid. This is also a fuming gas with a suffocating odor; but when liberated from an iodid with sulfuric acid it is more or less decomposed, and iodin set free. The latter is recognized by its violet-colored vapor. Since hydriodic acid is a reducing agent, if the temperature is high and the sulfuric acid concentrated, the latter may be reduced and hydrogen sulfid liberated. See VII, (h). (d) Sulfur compounds. These all give the test for sulfur as shown under III, (a). Having thus determined that the compound contains sulfur in some form, we have to determine further what compound we have. The following are the most important compounds of sulfur and the way to distinguish them. Treat them with warm concentrated sulfuric acid as uoder VII. In most cases dilute sulfuric acid will give the same reaction. Sulfids will yield hydrogen sulfid, which may be recognized by its odor. Sulfites will yield sulfur dioxid, which may be recognized by its odor. Thiosulfates will yield sulfur dioxid, together with a yellow precipitate of sulfur, which remains undissolved in the acid. Sulfates are entirely unaffected by both concentrated and dilute sulfuric acid, and so may be distinguished by this negative action. If a sulfate is strongly heated in a closed tube with a small piece of magnesium wire, the latter becomes incandescent, a vigorous action takes place, MgS is formed, and SO2 is liberated. After the tube is cool, if a little dilute acid is added to the contents, H2S is liberated. Sulfocyanates (called also sulfocyanids) give free sulfur, and HCN, which may be recognized as under VII, (g). The rare elements selenium and tellurium resemble sulfur very closely and give a similar reaction when heated on charcoal with sodium carbonate. Selenium when thus...

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 edition. Excerpt: ...acid. This is also a fuming gas with a suffocating odor; but when liberated from an iodid with sulfuric acid it...

Format:PaperbackDimensions:40 pages, 9.69 × 7.44 × 0.08 inPublished:October 12, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217672043

ISBN - 13:9780217672047

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