Essays on the effects of iodine in scrofulous diseases : including an inquiry into the mode of preparing ioduretted baths / translated from the French of M. Lugol, by W.B. O'Shaughnessy ; with an appendix by the translator, containing a summary of cases treated with iodine ...

  • O'Shaughnessy W. B. (William Brooke), 1809-1889.
Date:
1831
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Licence: Public Domain Mark

Credit: Essays on the effects of iodine in scrofulous diseases : including an inquiry into the mode of preparing ioduretted baths / translated from the French of M. Lugol, by W.B. O'Shaughnessy ; with an appendix by the translator, containing a summary of cases treated with iodine ... Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    to the Pharmacopeias, the editor states that iodine is sold at the absurdly extravagant price of U. 5s, per ounce. 2.—Hydriodate of Potash, This salt is prepared in various methods, viz. either by first preparing hydriodic acid, and then neutralising this with the carbonate of potash 3 or by boiling iodine with the car- bonate of potash, adding iodine to the hot solution till turme- ric paper is not turned brown ; an iodate and hydriodate are thus formed, and the hydriodate may be separated by strong alcohol, and leaves the iodate undissolved. There are other processes of equal efficacy, but the preceding are sufficient to enumerate here. When pure the hydriodate of potash (ioduret of potassium) is a beautiful white salt in cubical crystals; it consists of 100 hydriodic acid and 37.428 potassa; its taste is sharp, rather bitter; when devoid of excess of iodine it is free from smell. It is very soluble in water and alcohol, and its solution dis- solves a large quantity of free iodine. When the hydriodate of potash is mixed in solution with a solution of the salts of lead, silver, or mercury, double de- composition takes place, and an ioduret of the metal is thrown down. The subjoined diagram illustrates the action which ensues. S5 < H 0 (1. 1) ACETATE OF POTASH. (2. 2) WATER. > 0 W H (k ~ 0 Hydrogen (2) (1) Acetic acid H W Iodine (3).. 0 < (2) Oxygen hd Q 0 Potash (1)..- (3) Lead. 1-* d > 0 5? IODURET OF LEAD.