A translation of the pharmacopoeia of the Royal College of Physicians of London, 1836 / With notes and illustrations. By Richard Phillips.

  • Royal College of Physicians of London.
Date:
1841
Catalogue details

Licence: Public Domain Mark

Credit: A translation of the pharmacopoeia of the Royal College of Physicians of London, 1836 / With notes and illustrations. By Richard Phillips. Source: Wellcome Collection.

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    Potasses Carbonas, the correct name of the Po- tassae Subcarbonas. The mode of preparation is improved by using less water for the solution of the impure salt, and by employing it cold instead of boiling. By these alterations less of the impurity, but the whole of the carbonate of potash, is dis¬ solved. Potasses Acetas.—The quantities of acetic acid and carbonate of potash were incorrectly assigned, for only about If of the acetic acid was required. The mode of separating the acetate of potash formed, if indeed practicable, must have been extremely in¬ convenient. Potasses Sulphas.— The excess of sulphuric acid is now directed, and economically so, to be ex¬ pelled by heat, instead of, as formerly, saturated by the addition of carbonate of potash. That car¬ bonate of potash is of more value than the sulphate, is proved by the fact, that manufactories are carried on for converting the sulphate into carbonate. Potasses Bisulphas, the correct name of the Po- tassae Supersulphas. This preparation is rendered much more certain by the addition of sulphuric acid to the solution of the bisulphate of potash. According to the former directions, variable mix¬ tures of sulphate, sesquisulphate, and bisulphate of potash were obtained. Bodes Carbonas, formerly Sodae Subcarbonas. It is now intended that instead of the very impure carbonate of soda formerly used, and imported from Spain under the name of barilla, a much purer,