Kinetics of an Iodine Clock Reaction Pre-Lab Q uestions and Calculations You wil
ID: 1080317 • Letter: K
Question
Kinetics of an Iodine Clock Reaction Pre-Lab Q uestions and Calculations You will complete this quiz in Canvas 1 hour before your lab period. This page whe Canvas quiz. will not be turned in or graded. You may use this page to set up your calculations before you take the Canvas quiz. 1. Ir 5 drops of 0.15 M KI is added to 40 drops of Na:S-O, what is the final concentration of K1? to Yo 2. Which substance(s) is/are used in the experiment to keep ion concentrations and volumes constant but do not appear in the equations? What substance must be used up (limiting reactant) in the clock reaction to cause the solution to turn blue? 3. are used the solction to futn shke. th clak eaction to cause (-S,0,])ifM-6.25x10-M,M-OMA-os, andt,-20. s? 4. What is the rate ofSO Dt De 5, what is the rate of reaction using the values from question #4?Explanation / Answer
1) consider the molarity equation.
M1V1 = M2V2
Here, M1 = 0.15 M and V1 = 5 drops
V2 = 40 drops and M2 = ?
Substitute the known values.
5 x 0.15 = 40 x M2
M2 = 0.15/8 = 0.01875 M
2) (NH4)2SO4 and KNO3 are non-reactive compounds and are used to maintain a constant ionic strength in all the reaction mixtures.
3) I2 and S2O32- are used in the clock reaction to cause the solution to turn blue.
4) calculate the rate of S2O32- .
As given.
(-[S2O32-]/t)
=( 0 - 6.25 x10-4) M/(20-0) s
= - 0.3125 x10-4 M/s
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