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Updated: June 7, 2025
The sublimed iodine is then dried by placing it in a closed container over concentrated sulphuric acid. It may then be weighed in a stoppered weighing-tube and dissolved in a solution of potassium iodide in a stoppered flask to prevent loss of iodine by volatilization. About 18 grams of the iodide and twelve grams of iodine per liter are required for an approximately tenth-normal solution.
The solution of nitrate of lead may now have the proper tests applied. Tests. Sulphuretted hydrogen gives a black precipitate; liquor potassæ, white precipitate; sulphuric acid, white precipitate, insoluble in nitric acid; iodide of potassium, a bright yellow precipitate.
Salicylate of soda in full doses, or aspirin, usually proves effectual in relieving pain, but when this is very intense it may call for injections of heroin or morphin. Potassium iodide is of benefit in chronic cases. Relief usually results from bathing, douching, and massage, and from repeated gentle stretching of the nerve.
As the iodate is not always uniformly distributed throughout the iodide, it is better to make up a sufficient volume of a solution of the iodide for the purposes of the work in hand, and to make the blank test by using the same volume of the iodide solution as is added in the standardizing process. !Method B! PROCEDURE. Weigh out two portions of 0.25-0.27 gram of clean copper wire into 250 cc.
A dose or two of physic should he given, with an application of a calamine powder, and the administration of the iodide of potassium. Mr. Blaine gives a most valuable account of mange in the dog, part of which I shall quote somewhat at length. Mange exerts a morbid constitutional action on the skin; it is infectious from various miasmata, and it is contagious from personal communication.
The zinc and silver forming together a voltaic pair, with the salt water intervening, oxidation of the zinc takes place, and the silver surface commences to evolve hydrogen gas; while this is in a nascent condition it decomposes the film of iodide of silver, giving rise to the production of hydriodic acid, which is very soluble in water, and hence instantly removed.
The 'Peruvian Bark', or its active principle the disulphate of quina, is a valuable tonic in distemper, especially when combined with the iodide of iron; the iron increasing with the general tone of the system, and the iodine acting as a stimulant to the absorbents. 'Blisters' are occasionally useful or indispensable in some of the casualties and diseases to which the dog is liable.
Then run in the permanganate solution from a pipette or burette to determine roughly the amount required. Strong sulphuric acid also decomposes the oxalic acid. The excess of ferrous iron may also be determined by titration with potassium bichromate, if desired. The chlorine generated by the pyrolusite is passed into a solution of potassium iodide.
Mercuropotassic White cheesy Same. iodide. precipitate. Iodized potassic An immediate A brown oil crystallizing iodide. precipitate of after a time. periodate. Mercuric chloride. Same as picric acid. Same. Tannic acid. Slight cloud. Cloud hardly visible. Platinum chloride. By A. JORISSEN.
This process, therefore, differs from that with hyposulphite. The latter acts by dissolving the iodide of silver, the former by decomposing it. It is necessary not to leave the zinc in contact too long, or it deposits stains, and in large plates the contact should be made at the four corners successively, to avoid this accident. Gilding Solution.
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