Investigation of glycocoll and some of its products of decomposition / by Eben N. Horsford ; extracted from the American journal of science and arts, vols. III & IV, second series, 1847.

  • Eben Norton Horsford
Date:
1847
Catalogue details

Licence: Public Domain Mark

Credit: Investigation of glycocoll and some of its products of decomposition / by Eben N. Horsford ; extracted from the American journal of science and arts, vols. III & IV, second series, 1847. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    [304° F.j When exposed upon a watch crystal to the heat of a lamp, with a metallic screen between, and at such distance that the escape of vapor is barely discernible, a part of the mass in contact with the glass becomes browned, while another portion melts and shoots into crystals. These continue to form even after other portions have become charred. Rubbed together with finely pulverized hydrate of baryta, it becomes almost instantly fluid, the whole dissolving readily in water, from which, in pro- cess of time, crystals containing baryta and glycocoll deposit themselves. Here, in the act of combination, the water from one or both the ingredients was given up. The above circumstances, and others yet to be noted, induced the opinion that at a certain temperature, a lower one longer con- tinued, an atom of water from one half of the hydrated glycocoll might be given up, and the remaining half take its place. This would give almost precisely the analytical results of both Mulder and Boussingault, and yield from the formula determined on by us, precisely the composition given by Mulder. 2(C4 H4 N03, HO)—HO=C8 H9 N? 07. Below, follow the estimated per cent, constitution, according to the above formula, and the average of a series of analyses by Boussingault and Mulder. Estimate. Bous. Mulder 8 equiv. Carbon, .... 9 Hydrogen, ... 2 Nitrogen, 7 « Oxygen, .... 34-04 638 1985 39-73 33 79 644 19-90 39-70 3417 6-49 19 84 39-50 10000 100 00 10000 The effort to expel this half atom of water was unsuccessful. A temperature of 150° C. [302° F.] produced scarcely a percep- tive diminution in weight. At 170° C. [338° P.] it began to brown with the escape of gaseous products of decomposition. At 190° C. [374° F.] though portions had become quite charred, others had merely melted and crystallized anew. The support which the analyses of Boussingault give to the formula C4H4NOn,HO, will justify the following juxtaposition of the estimated per cents, and the actual results. Glycocoll and Oxyd of Silver; dried at 110° C. [230° F.] i5oussiri<j:iult. Horsford C16H15N4011+4AgO. C4H4N03-f-AgO. Carbon, . Hydrogen, Nitrogen, Oxygen, Ox. silver, Equiv. J6 = 96 15 = 15 4 = 56 11 = 88 4 = 464 Estimate. Result. Equiv. Estimate. 13-35 2-08 7-78 12% 64 53 13-62 221 8-07 12 35 6375 4 = 24 4 = 4 1 = 14 3 = 24 1 = 116 1318 219 7-69 13-21 63 73 719 loo-oo loo-oo J 182 | loo-oo