Researches into the laws of chemical affinity / by C.L. Berthollet ; Translated from the French by M. Farrell.

  • Berthollet, Claude-Louis, 1748-1822.
Date:
1804
Catalogue details

Licence: Public Domain Mark

Credit: Researches into the laws of chemical affinity / by C.L. Berthollet ; Translated from the French by M. Farrell. Source: Wellcome Collection.

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    carried on until a dry mass was obtained, which consequently may be considered as free from excess of acid. Water effects a change in the sulphate when in this state ; the mass which had been previ¬ ously white is rendered yellow by it ; the li¬ quid becomes acid, and retains a part of the sulphate in solution : a salt with excels of acid, and one with a less portion of acid, as they are usually termed, are formed ; but the pro¬ portions of these two salts are varied ; 1st, by the quantity of acid which the first combina¬ tion had retained ; 2d, by the quantity of wa¬ ter employed ; 3d, by the degree of tempera¬ ture, for the aétion of heat concurs with that of water. If, instead of simple water, an alkaline solu¬ tion be employed, the a61ion of which on the acid is greater than that of water, two different combinations will take place ; one will consist almost exclusively of oxyde, and the other will contain almost all the acid : the precipitate formed