The early history of chlorine / papers by Carl Wilhelm Scheele ... [and others].

  • Scheele, Carl Wilhelm, 1742-1786.
Date:
1897
Catalogue details

Licence: Public Domain Mark

Credit: The early history of chlorine / papers by Carl Wilhelm Scheele ... [and others]. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    weak and pure marine acid. U) The former colours of these fiowers, as well as those of the green plants, could not be restored either by alkalies or by acids, {d) Ex- pressed oils and animal fats, when they hung as drops on the glass tube or were rubbed on it, became m a short time tough like turpentine, (e) Cinnabar became white on the surface, and when the piece was washed m water a pure mercurius sublimatiis solution was obtained, but the sulphur was not altered. (/) Iron vitriol be- came red, and deliquesced. Copper and zinc vitriols were unaltered, {g) Iron filings were put into the same bottle and they dissolved. This solution was evaporated ad siccum and distilled with addition of oil of vitriol, when a pure marine acid, which did not dissolve gold, again passed over. {Ji) AH metals were attacked, and with gold it is noteworthy that its solution in this dephlo- gisticated marine acid forms with alkali volatile an aiinim fulminans. (/) When spiritus salis ammoniaci, prepared with Ume, hung in drops on the tube, there arose a white cloud, and a quantity of air bubbles escaped from the drops, which gave off a smoke when they burst asunder, {k) Alkali fixuin was changed into sal commune which decrepitated on charcoal, but did not detonate. (/) Arsenic deliquesced in these vapours: (w) Insects immediately died in them; («) and fire was immediately extinguished by them. 26. This proves sufficiently the great attraction which dephlogisticated marine acid has for the combustible.* It is possible that Stahl obtained such a dephlogisticated marine acid by means of iron, as he concludes from the yellow colour on the cork, and imagined that the marine acid was changed into nitrous acid. If a mixture of *[Den brenbara might be translated phlogiston; but Scheele also uses the latter word, so the literal translation is adopted here.]