An iodine clock kinetics experiment was performed by varying the composition of

Question

An iodine clock kinetics experiment was performed by varying the composition of reactant solutions and measuring resulting rates of reaction Trial 1 Trial 2 Reactant Solution A 10.0 mL r (aq) 10.0 mL I (aq) Reactant Solution B 10.0 mL S2Os(aq) 5.0 mL S208 Time to complete 10 seconds 5.0 mL S203(a) 5.0mL S0(aq) .0 mL starch (aq) 1.0 mL starch (aq) 20 seconds reaction How do trial 1 and 2 in the above table differ? O Trial 1 has twice as much as Trial 2 O Trial 2 has twice as much S20 as Trial 1 Trial 2 has half as much S2082-as Trial 1 O Trial 1 has half as much starch as Trial 2 Proposed mechanism 1 Proposed mechanism 2 Proposed mechanism 3 Proposed mechanism 4 Which of the four proposed mechanisms below would be supported by these results? Note: there may be more than one answer (scroll down to see alil four proposed mechanisms)

Explanation / Answer

In trial 2 we decreased the concentration of S2O82- by half and time taken doubles. So arte become half

So rate is directly proportional to [S2O8 2-]

So in slowest step there should be 1 molecule of S2O82- reacting
Answer: mechanism 2

mechanism 4 is wrong because this is complex reaction and must take more than 1 step

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