The pharmacopoeia of the Royal College of Physicians of London, M.DCCC.IX / Translated into English, with notes, &c. By Richard Powell.

  • Royal College of Physicians of London.
Date:
1809
Catalogue details

Licence: Public Domain Mark

Credit: The pharmacopoeia of the Royal College of Physicians of London, M.DCCC.IX / Translated into English, with notes, &c. By Richard Powell. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

    146/535 (page 94)
    The crystals of subcarbonate of soda, if exposed to air, lose a part of their water, and effloresce or fall into powder. Hence, the proportion of soda contained in the salt kept in the shops becomes indefinite. In this effloresced salt the pro- portion of water lost will be nearly one-half of the whole. By a definite exposure to heat thewhole water maybe evaporated, and the salt thus prepared is more useful and uniform in many of its applications. Care must be taken that the heat be not urged too far, for a red heat deprives it also of its carbonic acid. Dried subcarbonate. of soda contains, according to Kirwan, carbonic acid 40,04, soda 59,86; and 100 parts of the crystals are deprived of their 64- of water. SODJE CARBONAS. CARBONATE OF SODA. Take of Subcarbonate of Soda, a pound. Subcarbonate of Ammonia, three ounces. Distilled Water, a pint. Having previously dissolved the soda in the water, add the ammonia, then by means of a sand bath apply a heat of 1800 for three hours, or until the ammonia be driven off. Lastly, set the solution by to crystallize. The remaining solution may be evaporated and