KINETICS AND MECHANISM OF SOLID-STATE REACTIONS OF SILVER TUNGSTATE WITH MERCURIC BROMIDE AND MERCURIC-CHLORIDE

被引：6

作者：

JAIN, A ^{[1
]}

BEG, MA ^{[1
]}

机构：

[1] ALIGARH MUSLIM UNIV,DEPT CHEM,ALIGARH 202002,UTTAR PRADESH,INDIA

来源：

POLYHEDRON | 1995年 / 14卷 / 15-16期

关键词：

D O I：

10.1016/0277-5387(94)00432-E

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

1The kinetics and mechanism of the Ag2WO4-HgBr2 and Ag2WO4-HgCl2 reactions have been studied in the solid state. The kinetics have been carried out by a visual technique. Both the reactions follow the parabolic rate law X(2) = Kt, where Xis the thickness of product layer at time t and K is the parabolic rate constant. The kinetics have been studied at several temperatures, for different lengths of air-gap between the two reactants and for different particle sizes of the reactants. It has been demonstrated that diffusion in both the reactions is predominantly controlled by the vapour phase, but diffusion by surface migration is also significant. In order to understand the mechanism of the reactions, X-ray powder diffraction, chemical analysis, conductivity and thermal studies have been carried out. Silver tungstate reacts with mercuric bromide and mercuric chloride in the molar ratio 1:1 to give AgBr, HgWO4 and AgCl, HgWO4, respectively, as the end products.

引用

页码：2293 / 2299

页数：7

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