your lab write-up, three possibilities for the mechanism of the rate determining

Question

your lab write-up, three possibilities for the mechanism of the rate determining step were listed. 1. The rate-determining step has two iodide ions coming together. 2. The rate-determining step involves a persulfate ion decomposing. 3. The rate-determining step has an iodide ion and a persulfate ion coming together. Which mechanism did your experiment confirm? the third . (a) If the first mechanism is correct, what should happen to the rate if the concentration of iodide ion is doubled and other concentrations are held constant? (b) If the first mechanism is correct, what should happen to the rate if the concentration of persulfate ion is doubled and other concentrations are held constant? (c) If the second mechanism is correct, what should happen to the rate if the concentration of iodide ion is doubled and other concentrations are held constant? (d) If the second mechanism is correct, what should happen to the rate if the concentration of persulfate ion is doubled and other concentrations are held constant?

Explanation / Answer

a) rate=k[I]^2 because there are two iodide ions which react in the rate determining step. so if concentration is doubled then the rate should quadruple (4x) b) the persulfate ion is not part of the rate determining step if the first mechanism is correct: No Change c) for second is rate=k[persulfate] so..No Change b/c iodine is not part of the rate determining in the second mechanism d) Now if the persulfate ion concentration doubles the rate doubles.

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