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Addition of a 1.0-mL portion of 0.40 M Na2S2O3 solution (S2O32- ions) convert I2 (black with...

Addition of a 1.0-mL portion of 0.40 M Na2S2O3 solution (S2O32- ions) convert I2 (black with starch) back to I⁻ (clear) into the solution via the following reaction: I2(aq) + 2 S2O32-(aq) → 2 I⁻(aq) + S4O62-(aq)

1. Consider the reaction solution, which contains 25.0 mL of 0.40 M (NH4)2S2O8 in the total volume of 100.0 mL. Calculate the initial number of moles of S2O82- ion in the solution:______moles?

2. From Question 2 and 3, determine the amount of S2O82- ion remaining in solution after the I2 from question 2 is produced: ______moles?

3.  If the color change occurred in 94 seconds, calculate the rate of disappearance of S2O82- in M/s. _Hint: Answer from Question 2 and the total volume is 100-mL):

_________ x 10-5M/s?

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