5 the peroxydisulfate ion (s2o8-2 )reacts with the iodid ion in aqueous solution

Question

5 the peroxydisulfate ion (s2o8-2 )reacts with the iodid ion in aqueous solution via the reaction;

s2o8-2(aq) +3I-  = 2SO4 (aq) +I3-(aq)

an aqueous solution contaning 0.050M ion and 0.072M of I- is prepared and the progress of the reaction followed by measuring (I-). THE data obtained is given in the table below.

    time (s)     0.000          400.0           800.0          1200.0        1600.0

[  I-](M)          0.072           0.057          0.046          0.037           0.029

A the average rate of the disappearance of I- between 400.0 and 800.0s is - M/s

B the avarege rate of disappearance of I -  in intial 400.0s is M/S

Explanation / Answer

From the stoichiometrie of the reaction follows that for every three moles of iodide one mole of ions reacts away:
?n(S?O??) = n?(S?O??) - n(S?O??) = 1/3

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