Publication costs o] this article were assisted bythe IB2/f Corporation. * E l e c t r o c h e m i c a l Society Active Member. i P r e s e n t a d d r e s s : A r g o n n e N a t i o n a l L a b o r a t o r y , C h e m i c a l Engineering Division, Argonne, Illinois 60439. K e y w o r d s : chlorine, caustic, electrolysis, diaphragm, computer.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 35.8.191.249 Downloaded on 2015-03-31 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 35.8.191.249 Downloaded on 2015-03-31 to IP Vol. 124, No. i A DIAPHRAGM-TYPE CHLORINE CAUSTIC CELL ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 35.8.191.249 Downloaded on 2015-03-31 to IP

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The rate constant of the title reaction has been measured at various H2SO4 concentrations (0.02‐l M) using a Br′ selective electrode.