n the presence  of excess thiocyanate ion, SCN-, the following reaction is first order in iron(III) ion, Fe3+; the rate constant is 1.27/s. Fe3+(aq) + SCN-(aq)  → Fe(SCN)2+(aq). How many seconds would be required for the initial concentration of Fe3+ to decrease to 12.5% of its initial value?  Express your answer to two decmal positions.

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Chapter13: Rates Of Reaction
Section: Chapter Questions
Problem 13.66QP: In the presence of excess thiocyanate ion, SCN, the following reaction is first order in iron(III)...
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In the presence  of excess thiocyanate ion, SCN-, the following reaction is first order in iron(III) ion, Fe3+; the rate constant is 1.27/s.

Fe3+(aq) + SCN-(aq)  → Fe(SCN)2+(aq).

How many seconds would be required for the initial concentration of Fe3+ to decrease to 12.5% of its initial value?  Express your answer to two decmal positions.

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