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See detailSur un hydrate de soufre
Spring, Walthère ULg

in Bulletin de la Classe des Sciences. Académie Royale de Belgique (1906), (7), 452-459

Spring, W. Bulletin de la Classe des Sciences, Academie Royale de Belgique (1906), 1906, 452-59; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). If ... [more ▼]

Spring, W. Bulletin de la Classe des Sciences, Academie Royale de Belgique (1906), 1906, 452-59; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). If one lets sulfurous acid in water and hydrogen sulfide work on the other, then Polythionic acid form and sulfur, what latter after DEBUS (Chem. News 57. 87) a new allotropic modification with the ability to form with water a colloidal solution is to be (sulfur δ). The alleged Pentathionic acid shows up with intensive illumination not as an homogeneous body, but as a colloidal solution, and the sulfur δ of DEBUS not a allotropic modification, but a hydrate is S8•H2O. One receives it, if one removes and up to the constant weight in the vacuum dries the acid from with above reaction the formed S by months-long dialyze with daily fresh water, as a yellowish, partially translucent mass from conchoidal break; there is 51.6% sulfur when washing with CS2. The part unsolvable in CS2 dismisses from about 80° at water, with the melting point of the S the formula S8•H2O appropriate quantity (S8 = molecular size of the firm S!). The density of hydrate pressed in cylinder form amounts to with 19°, related to water of 4°, 1.9385; meadow after 93.6/2.07 6.4/1 = 51.6; = 100/51.6 = 1.9380 on octahedral S, if were residual insoluble S not after removal water in CS2. Powdered hydrate loses 2.41% H2O, the pressed 1.33% with 7-monthly standing over H2SO4; it thus has a vapor pressure. A part of hydrate is destroyed; simultaneous increased its density. If the drained body with water remains in contact, then the density decreases again; it exists thus a condition of the S, which connects itself directly with water, and which delivers the water in the dry medium again. In the desiccator partially S give in powder form 3.1%, in the pressed condition 5.8% at CS2 in solution dehydrated. Pressure favors thus the transition of the matter to a condition of larger density. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailSur un hydrate de soufre
Spring, Walthère ULg

in Recueil des Travaux Chimiques des Pays-Bas et de la Belgique (1906), XXV

Spring, W. Recueil des Travaux Chimiques des Pays-Bas (1906), 25, 253-9 ; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). The sulphur which is ... [more ▼]

Spring, W. Recueil des Travaux Chimiques des Pays-Bas (1906), 25, 253-9 ; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). The sulphur which is formed together with polythionic acids when hydrogen sulphide and sulphur dioxide react in aqueous solution is a mixture of soluble sulphur and a definite hydrate, S8,H2O, and not a new allotropic form of sulphur, "sulphur δ", as described by Debus (Chem. News, 1888, 57, 87). In order to separate the hydrate from the soluble sulphur, the mixed precipitate in washed by dialysis until it is neutral to litmus, and dried in a vacuum at the ordinary temperature until the weight is constant; the yellow mass thus obtained is powdered, sifted through silk, again dried in a vacuum, and finally extracted with carbon disulphide, which dissolves 51.6 per cent. of the total mass. The residual sulphur hydrate, S8,H2O, when compressed into cylinders, has a sp. gr. 1.9385 at 19°/4°, loses its water at 80°, and has a slight vapour pressure at the ordinary temperature, the powdered substance losing 2.41 per cent. and the compressed substance 1.33 per cent. when kept over sulphuric acid for 205 days. The partially dried powder contains 3.1 per cent. and the compressed substance 5.8 per cent. of sulphur soluble in carbon disulphide. If, however, the hydrate consisted of octahedral sulphur combined with water, the amount of soluble sulphur in the partially dried powder would be 35.186 per cent.; it is probable, therefore, that the hydrate is derived from an amorphous unstable variety of sulphur which is transformed slowly under ordinary conditions, and more rapidly under pressure, into soluble sulphur. Reprinted with the permission of the American Chemical Society. Copyright © 2010 American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailSur l'origine des nuances vertes des eaux de la nature et sur l'incompatibilité des composés calciques, ferriques et humiques en leur milieu
Spring, Walthère ULg

in Recueil des Travaux Chimiques des Pays-Bas et de la Belgique (1906), XXV

Spring, W. Recueil des Travaux Chimiques des Pays-Bas (1906), 25, 32-39; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). After Baron V. AUFSESS ... [more ▼]

Spring, W. Recueil des Travaux Chimiques des Pays-Bas (1906), 25, 32-39; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). After Baron V. AUFSESS (Die Farbe der Seen. Inaug.-Diss. Muenchen 1903) the refraction of the light does not have influence on the change of the blue color water, mainly also because one can obtain green water by dissolving lime compounds/connections, yellow or brown water by solve ones of humus substances in pure water. The going by experiments of the authors, which are down partly in detail described, led however to the subsequent results: the lime compounds/connections natural water do not have inherent color and are not a cause of the much-observed green coloring in with examination appearing even clear lime water; the green, after elimination of the dyes residual coloring contained in the water is the result of the refraction of the light through invisible portion cups, which the water still includes, and whose presence can be done by an intensive light beam. The lime compounds/connections affect strongly fell in the water contained the ferric compounds/connections and with these on the humus substances, which the latter natural color water strongly change. Lime salts protect therefore the blue color water. In case of the not-blue, lime-containing, natural water an equilibrium between the cleaning effect of their lime compounds/connections results and steady influxes of the humus and ferric compounds/connections, which let disappear its brown coloring lower for itself the blue color water. The blue, more or less greenish color of the purest water give information over the point, where the equilibrium between the antagonists is fixed. Purely blue water (6 m coating thickness) becomes green by dissolving lime from Icelandic double spar; when introducing CO2 a clear, somewhat less green solution of acid calcium carbonate forms; also gypsum colors such water green. During the passage of radiation of electrical light these solutions appear, particularly the CaH2(CO3)2-containing, optically clouds, it carefully to dry was evaporated, the residue contained partially organic substance, partially SiO2 or silicates (from the glass of the container), which were contained in the solution therefore in the colloidal condition. After filtering the other Ca-containing solutions by animal charcoal these showed the same blue color as pure water. When regarding by a pipe of 6 m length appears pure water with 1/1 000 000 part ferric hydroxide brown, with 1/2 000 000 green, with 1/5 000 000 unmodified blue. With humus substances the blue color is already changed by more than 1/40 000 000 part. Ferric salts color brownish; they are particularly reduced by humus substances, in the light, sometimes partially to ferrous compounds/connections, whose color is not possible, and which with the humus substances insoluble, failing compounds to be received. To a liter of clear solution with 1/3 000 000 if part colloidal Fe(OH) 3 (to dissolve of FeCl3 in H2O) is added a same volume acid calcium carbonate or CaSO4-Solution, then a flocculation, tags begins is because of the container soil a brown, ocher-colored dirt, the water is perfectly clear, appears green and leaves a residue of CaCO3 or CaSO4 without trace iron after few instants; the sediment contains 85-90% Fe(OH)3, CaCO3 or CaSO4. Also with insoluble CaCO3 begins the flocculation of the ferric compounds/connections immediately; similarly soluble salts work; with sodium chloride (sea water) a trace remains iron in solution. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailLa commune de Liège dans l'histoire
Kurth, Godefroid ULg

Book published by Ch. Desoer (1906)

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See detailNotice sur Richer
Kurth, Godefroid ULg

in Académie royale des sciences, des lettres et des beaux-arts de Belgique (Ed.) Biographie nationale, t. XIX (1906)

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See detailNotice sur Resignatus, évèque de Tongres
Kurth, Godefroid ULg

in Académie royale des sciences, des lettres et des beaux-arts de Belgique (Ed.) Biographie nationale, t. XIX (1906)

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See detailLe mouvement historiographique en Belgique
Kurth, Godefroid ULg

in Ned, Edouard (Ed.) L'Énergie belge, 1830-1905 : l'opinion d'une élite (1906)

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See detailNote bibliographique sur l'ouvrage de M. A. Lefort : Histoire du département des forêts
Kurth, Godefroid ULg

in Bulletin de la Classe des Lettres et des Sciences Morales et Politiques (1906)

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See detailNote bibliographique sur le tome V du Catalogue des manuscrits de la Bibliothèque royale par le R. P. Van den Gheyn
Kurth, Godefroid ULg

in Bulletin de la Classe des Lettres et des Sciences Morales et Politiques (1906)

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See detailRapport de M. Kurth, premier commissaire au concours annuel de 1906, section d'histoire et de littérature
Kurth, Godefroid ULg

in Bulletin de la Classe des Lettres et des Sciences Morales et Politiques (1906)

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See detailSur la forme de la contraction du muscle ventriculaire
Fredericq, Léon ULg

in Archives Internationales de Physiologie (1906), III

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See detailLa conception moderne de l'état
Merten, Oscar ULg

Speech (1906)

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See detailLes oscillations respiratoires ou de second ordre de la pression sanguine
Fredericq, Léon ULg

in Archives Internationales de Physiologie (1906), IV

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See detailSur une forme particulière de fibrillation du muscle cardiaque
Fredericq, Léon ULg

in Archives Internationales de Physiologie (1906), III

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