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三碘络离子
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The equilibrium of I2+I?I-8 is studied by using spectrophotometry. Theproduction constant K of I-8 complex ion, the molar absorptivity εI2 and εI-3 of the I2 and I-3 complex ion are determined at 25℃ and 460 nm, the first being 805.8and the other two being 742.8 and 1 202 L.mol-1.cm-1 respectively, in accordance with absorbance additivity principle and the nonlinear function relation of the absorbance A of the I2-KI dilute solution to the total concentration C1- of iodide ion in the solution, when the iodine...

The equilibrium of I2+I?I-8 is studied by using spectrophotometry. Theproduction constant K of I-8 complex ion, the molar absorptivity εI2 and εI-3 of the I2 and I-3 complex ion are determined at 25℃ and 460 nm, the first being 805.8and the other two being 742.8 and 1 202 L.mol-1.cm-1 respectively, in accordance with absorbance additivity principle and the nonlinear function relation of the absorbance A of the I2-KI dilute solution to the total concentration C1- of iodide ion in the solution, when the iodine concentration CI2 in the solution is identical,measuring the change of A with CI- and making the nonlinear function least square curve fitting of the data of the A and CI- on a pocket PC-1500 computer The method is simple, it is unnecessary to introduce special hypothese. The validity of the procedure is confirmed by the good agreement of the vallces of experimental with the ones in literatures. For the equilibrium system which involves a few coloured species, this method can conveniently be employed to determine the equilibrium constant, the molar absorptivity of individual coloured species and the equilibrium concentration of individual species in the solution.

应用分光光度法,研究了水溶液中碘和碘离子反应生成三碘络离子的平衡。当碘的总浓度c_I相同时,通过测定I_2-KI稀溶液的吸光度A随碘离子的总浓度C_I-的变化,根据吸光度的加和原理和A与C_-的非线性函数关系,在PC-1500微机上用非线性函数的最小二乘曲线拟合A与C_I-数据,得到298K时三碘络离子生成反应的平衡常数K为805.8,298K 460nm时碘和三碘络离子的摩尔吸光系数eI 和cI-分别为742.8和1102L·mol~(-1)·cm~(-1)。方法操作简便,结果准确,摒弃了不必要的假定。对水溶液中存在数种有色物质的简单平衡体系,该法可方便地测得反应的平衡常数,各有色物质的摩尔吸光系数及各物质的平衡浓度。

 
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