Lecture-notes on chemistry for dental students : including dental chemistry of alloys, amalgams, etc., such portions of organic and physiological chemistry as have practical bearing on the subject of dentistry, an inorganic qualitative analysis with specially adapted blowpipe and microscopical tests, and the chemical examination of urine and saliva / by H. Carlton Smith.

  • Smith, H. Carlton (Henry Carlton)
Date:
1906
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Licence: Public Domain Mark

Credit: Lecture-notes on chemistry for dental students : including dental chemistry of alloys, amalgams, etc., such portions of organic and physiological chemistry as have practical bearing on the subject of dentistry, an inorganic qualitative analysis with specially adapted blowpipe and microscopical tests, and the chemical examination of urine and saliva / by H. Carlton Smith. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    water, an excess of caustic soda added, and heat applied when NH3 is evolved, which may be detected by litmus paper or odor as above. Sulphur and Phosphorus are first completely oxidized either by fusion of the substance with alkali nitrate and car- bonate, or by treatment in the wet way with fuming HNO3 or mixture of KCIO3 and HCl. The resulting sulphate or phos- phate is detected by the usual qualitative methods (page 44). A sulphur test may also be made by heating the substance with a little concentrated NaOH in the test-tube. A little sodium sulphid will thus be formed which may be detected by dropping onto a bright silver coin or by testing with lead acetate solution. Halogens.—CI, Br, and I cannot be detected in organic combinations by the ordinary qualitative test with AgNOa and dilute NHO3, but must first be converted into correspond- ing inorganic haloid salts. This may be done by heating the organic substance strongly with pure lime, when calcium chlorid, bromid, etc., will be formed, which may be dissolved in water and tested in the usual way. A test for chlorin or iodin may also be made by heating with copper oxid on a platinum wire in the Bunsen flame, chlorin giving first a blue then a green color to the flame. Iodin gives a green only (Beilstein). Exp. 1. Test for presence of C, H, and S in dried albumen. Exp. 2. Test for S by the caustic soda test. Exp. 3. Test for P in casein precipitated from milk. Exp. 4. Make tests for the halogens with a few drops of chloroform. The Hydrocarbons. The hydrocarbons are organic compounds of carbon and hydrogen only. The simplest of these being marsh-gas or methane (CH4). The molecule of this substance consists