A manual of pharmacy / By William Thomas Brande.

  • William Thomas Brande
Date:
1833
Catalogue details

Licence: Public Domain Mark

Credit: A manual of pharmacy / By William Thomas Brande. 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.

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    peculiar irregularity of density'; so that the strength or value of acetic acid can only be judged of by its saturating power. Keal (dry) acetic acid saturates almost exactly its own weight of carbonate of lime (powdered Carrara marble) ; or 50 parts of acetic acid are saturated by 117 of crystallised carbonate of soda. Upon either of these data the real value or strength of any sample of acetic acid is easily determined, by the rule of proportions. The ultimate composition of acetic acid has beeu determined by Dr. Prout, and from his analysis and that of the acetates, we deduce 51 as its equivalent number, and it may be regarded as composed of 4 proportionals of Carbon 6X4 = 24 46'06 3 Oxygen 8X3 = 24 47-06 3 Hydrogen^... 1X3 r= 3 5-88 51 100-00 According to this analysis there is no excess of oxygen, but the oxygen and hydrogen are in the exact proportions to form water. As an article of the Materia Medica, acetic acid is chiefly valuable as a rubefacient stimulant; and as it is soluble in alcohol, and dissolves camphor, liniments of camphorated spi- rit of wine may be sharpened to any desired extent by the ad- dition of concentrated acetic acid. 8 Spiritus Camphorati fj^j* Acidi Acetici fort. f^. Misce fiant embrocatio parti affectaj applicanda. To this any of the volatile oils may be added, for acetic acid also dissolves most of them, as we see in aromatic vinegar', which is the acid thus perfumed, and furnishes an agreeable ' This ia showu in the following table drawn up by Dr. Thomson (First Prin. ii. 135.) Acid. Water. Spccilic Gravity at CO. 1 atom + 1 atom 1-06296 1 h 2 1-07060 1 -+- 3 1-07080 1 H 4 1-07132 1 h 5 1-06820 1 j- 6 1-06708 1 \- 7 1-06349 1 1- 8 1-05974 1 ^ 9 l-0.'i794 1 y 10 1-05430 * Taylor on the Acctomcter, Quarterly Journal, vi. 255. ^ According to Dr. Paris, Henry's Aromatic Viuegur is an acetic solution of camphor and of the oils of cloves, lavender, and rosemary. A preparation of this kind, he observes, may be extemporaneously made hy ])utting 3j. of acetate of potass into a phial, with a few <lrop8 of some fragrant oil, and ]\\x\. of sulpliinic acid. (Pharm.icnlofriii, II. 15.)—Marseilles, or Thieves' Vinegar, consists of carnphor, volatile oils, and vinegar,and re:?umbles (he yJcclum ^Jrumalicuin of the Kdinbtugh PharmacopoBia.