The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . readily uniteand produce a gaseous acid, the Hydriodic Acid. 566. It is prepared by the action of moist Iodine uponPhosphorus, and, as it is absorbed by water, it must be re-ceived over Mercury. It is colourless, very sour, and smellslike muriatic acid. With bases it forms a class of Saltstermed Hydriodates. 567. it is in the state of Hydriodate of potass, that Iod
The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . readily uniteand produce a gaseous acid, the Hydriodic Acid. 566. It is prepared by the action of moist Iodine uponPhosphorus, and, as it is absorbed by water, it must be re-ceived over Mercury. It is colourless, very sour, and smellslike muriatic acid. With bases it forms a class of Saltstermed Hydriodates. 567. it is in the state of Hydriodate of potass, that Iodineexists in sea. weeds, aud since it is a deliquescent salt, it re-mains in the mother liquor, after separating the carbonate ofsoda and other salts by crystallization. NITRIC ACID. 568. If we distil together equal weights of Nitre and Oilof Vitriol (Sulphuric acid) in a glass retort, connected with atubulated receiver, which is made to pass into a bottle, asrepresented in the annexed cut, tve shall obtain this acid,and be enabled to observe the phenomena which attend itsproduction. * This term is used to express the condition of a gas at the moment it•s disengaged from a solid combination. 280 PARIS S MEDICAL 569. .In this process the nitric acid is separated from itscombination with potass, in which state it exists in the nilre,by the superior affinity of the sulphuric acid for the nitric acid thus disengaged is volatilized by the heatand carried over into the receiver, where it is condensed,and collected in the bottle to which it is attached. Thephenomena which accompany the distillation will vary insome measure with the quantity of Sulphuric acid employed ;if this be less than that directed by the London College,as soon as the materials are heated, orange yellow vapoursare disengaged, which in a short time, as the heat increases,become paler, and continue ^o until the ingredients in theretort are nearly dry and the heat is augmented to 500°;when,
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