The reaction was second order with respect to NO2, suggesting that N2O4 was the reactive species. Reactive uptake coefficients, calculated with respect to [N2O4], were independent of relative humidity with an average value of BET = (6.1 卤 0.3) 104. Concurrent gas phase UV-visible spectroscopy...
Commercial samples often contain a large amount of impurities; they may be removed by sublimation. The element may also be prepared in an ultrapure form through the reaction of potassium iodide with copper(II) sulfate, which gives copper(II) iodide initially. That decomposes spontaneously to copper...
reaction of potassium iodide with copper sulfate. Several other methods of isolating the element are known. Iodine is a bluish-black, lustrous solid, volatilizing at ordinary temperatures into a blue-violet gas with an irritating odor; it forms compounds with many elements, but is less active ...
The process is also practical as an introduction to reaction rates and kinetics. A solution of hydrogen peroxide is mixed with one containing potassium iodide, starch and sodium thiosulfate. After a varying amount of time the colorless mixture suddenly turns dark blue which is one of a number ...
used ashes of iodine-rich seaweed as one of its ingredients. It was while cleaning out waste deposits with acid and heat that Courtois noticed beautiful violet-colored vapors that deposited as metal-like black crystals on the cooler surfaces of the reaction chamber. By 1813, Courtois's unknown...
It could be reduced to iodide ion only with strong reducing agent, such as hydrogen sulphate and sodium thiosulfate: (1) I2+H2S=S+2HI (2) I2+2S2O32-=S4O62-+2I- The latter reaction can be used to quantify iodine in analytical chemistry, which is the basis of the iodometric ...
Compounds in which iodine is found to have oxidation numbers of 7, 3, 5, and 1 are also well known. Iodine is prepared commercially by treatment of natural salt solutions (seawater or brines) with chlorine (a more reactive halogen), according to the reaction: ...
In the latter case, the overall reaction with alkene is often complete within 30 min. Alternatively, iodine can be allowed to react with a large excess of silver cyanate in a variety of solvents, and the precipitated silver iodide can be filtered off. Alkenes can then be added to the ...
The reduction of iodine and the oxidation of iodide were studied voltammetrically at a rotated platinum electrode in various media of pH 0 to 8. In acid solution the reaction I 2 + 2e = 2I - proceeds reversibly. The corresponding cathod... IM Kolthoff,J Jordan - 《Journal of the Ameri...
, known ashydroiodic acid, is a strong acid that is used to prepare iodides by reaction with metals or theiroxides,hydroxides, andcarbonates. Iodine exhibits a +5 oxidation state in the moderately strong iodic acid (HIO3), which can be readily dehydrated toyieldthe white solid iodine ...