Method for direct oxidation of iodine ion by mercury ion
A technology for oxidizing iodine and mercury ions, which is applied in the directions of iodine, iodine/hydrogen iodide, etc., can solve problems such as inability to achieve, and achieve the effects of simple device, easily available materials, and strong reliability.
Inactive Publication Date: 2009-06-17
HUNAN UNIV OF SCI & TECH
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Obviously, this reaction phenomenon is because the precipitation reaction rate is faster than the oxidation-reduction reaction rate. Practice has proved that it is impossible to realize Hg 2+ Direct Oxidation I - of
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[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0013] see figure 1 , is the device that the present invention adopts, and it is the KI solution of 1mol / L and 0.2mol / L Hg(NO 3 ) 2 solution, respectively, into two 100mL beakers. After connecting the graphite electrodes 1 at both ends of the wire, insert the two graphite electrodes 1 into the beakers respectively, and at the same time install the salt bridge 2 (that is, the agar gel with saturated KCl solution in the U-shaped tube, its function is to balance the two cups of solution charge), observe the color change of the beaker solution and the phenomenon of the electrode. The experimental results showed that as the reaction progressed slowly, the KI solution gradually changed from colorless to light yellow, and the color gradually deepened as time went on. Further detection of this yellow solution can turn the starch solution blue. If ...
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The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a method for directly oxidizing iodide ions by mercury ions. The method comprises the following: two ends of a conducting wire are connected with a graphite electrode respectively, the two graphite electrodes are inserted into two containers respectively, and a salt bridge is arranged between the two containers at the same time; prepared KI solution and Hg(NO3)2 solution are poured into the two containers respectively; the color of the KI solution is changed into light yellow from colorless, then the color is gradually deepened along with prolongation of time, and iodine is generated in the container; and the color of the Hg(NO3)2 solution has no change, but the graphite electrode inserted into the Hg(NO3)2 solution brightens gradually, and such a brightened substance is generated metal mercury. The method effectively solves the problem of directly oxidizing I<-> by Hg<2+>, can provide help for scientific research, teaching, production and life better, and has the advantages of simple equipment, convenient operation, easily obtained drugs and remarkable phenomenon.
Description
technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a method for mercury ions to directly oxidize iodine ions. Background technique [0002] In chemical theory, the electrode potential of mercury ions , higher than the electrode potential of iodide ions , in principle, the mercury nitrate [Hg(NO 3 ) 2 ] solution mixed with potassium iodide (KI) solution, Hg 2+ can directly oxidize I - Iodine I 2 And itself is reduced to metallic mercury Hg, namely: Hg 2+ +2I - =Hg+I 2 . But in fact there is no redox reaction at all and no redox reaction occurs, but a precipitation reaction occurs, namely: Hg 2+ +2I - =HgI 2 ↓(red), when I - When it is excessive, further coordination reaction occurs, that is: HgI 2 +2I - =[HgI 4 ] 2- , the chemical reaction can be found in: (1) Beijing Normal University, Central China Normal University, Nanjing Normal University edited, Inorganic Chemistry (...
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IPC IPC(8): C01B7/14
Inventor 李大塘彭斌龙云飞禹良才肖敦乾
Owner HUNAN UNIV OF SCI & TECH