The Edinburgh new dispensatory ... including complete ... translations of the ... London pharmacopoeia, published in 1791; Dublin pharmacopoeia, published in 1794; and of the new ed. of the Edinburgh pharmacopoeia, published in 1803 ... / [Edited, with extensive alterations and additions] By Andrew Duncan, jun.

  • Lewis, William, 1708-1781
Date:
1803
Catalogue details

Licence: Public Domain Mark

Credit: The Edinburgh new dispensatory ... including complete ... translations of the ... London pharmacopoeia, published in 1791; Dublin pharmacopoeia, published in 1794; and of the new ed. of the Edinburgh pharmacopoeia, published in 1803 ... / [Edited, with extensive alterations and additions] By Andrew Duncan, jun. Source: Wellcome Collection.

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    great rapidity on diluted fulphuric acid ; in which cafe it is not oxidized at the expence of the acid itfelf, but by decompofing the water, and therefore the hydrogen of the water is fcparated in the form of gas. The aftion of the acid and iron upon each other of- ten ceafes before the acid is nearly faturated, and may be renew- ed by the addition of a little wat^r. The' reafon is, that all the water which was not decompofed is employed to diffolve the ful- phate of iron formed. The properties and ufes of fulphate of iron have been already mentioned. SULPHAS FERRI EXSICCATUS, Ellin. • Dried Sulphate of Iron. Take of Sulphate of iron any quantity. Expofe it to the aftion of'a moderate heat in an unglazed earthen vefl'el, until it become white and perfectly-dry. The heat applied here mull not be fo gfeat as to decompofe the fulphate of iron, but only to deprive it of its water of cryflalli- zation. • OXIDUM FERRI RUBRUM. ‘ Edin. Red Oxide of Iron. Expofe dried fulphate of iron to an intenfe heat, until it is con- verted into a very red matter. By the violent heat applied in this preparation, the fulphate of iron is completely decompofed, and copious white fumes are ex- pelled. The iron is converted into the red oxide; part of the fulphuric acid is therefore reduced to the ftate of fulphurous acid, and the reft of the acid is expelled in a very concentrated ftate. This procefs was formerly employed in this country, and ftill is employed in Germany, for the preparation of fulphuric acid; which, however, from the prefence of the fulphurous acid, was poffefl'ed of fome peculiar properties, fuch as emitting fumes and cryftallizing. The reftduum is compofed of red oxide of iron, combined with a little red fulphate of iron, which renders it de- liquefcent. To obtain the oxide perfectly pure, the reliduum muft therefore be walked with water, and dried quickly, to pre- vent the abforption of carbonic acid. TINCTURA MURIATIS FERRI. Edin. ^inliure of Muriate of Iron. Take of The purified fcqles of oxide of iron in powder, three ounces; Muriatic