030.102 Final: Final Solutions Karlin Spring 1991
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May 8, 1991 page 2 of 11 t,-i 1tg!j. " t;1. 4. (l0) consider the following reaction (unbalanced; acid solution) of dichromate ion with iodide. Cv~}. (;j~ u t i ~ ~i t l t(- l l . :~}:-. _)":~j-~. -,). ," i{u-")-"-=:--o-,,. ,-(-1~/ (a) calculate the standard emf for an electrochemical cell described by this reaction. fc : . Volts (b) calculate the emf generated by the cell when [cq07 2 ] = 2. 0 m, [h+] = 1. 0 m, [1 ] = 1. 0 m and [cr3+] = 1. 0 x 10 5 m. (_ ::" (l"jrl j, K sp = 1. 6 x 10 14 for ni(ohb (assume that the. ~-
