Rates of Chemical Reactions 1: A Clock Reaction 2. What effect does doubling the
ID: 493208 • Letter: R
Question
Rates of Chemical Reactions 1: A Clock Reaction
2. What effect does doubling the concentration of I- have on the rate of this reaction?
3. What effect does changing the [S2O8-2] have on the reaction?
A. Preliminary Experiments l. What are the colors of the following ions? K Color I Color less 2. The color of the starch complex is lui 6kde B. Kinetics Experiment Solution 1. Initial [s2os2-J 0.05 M; initial 0.05 M. Time experiment started Time (s) between Total moles of S2 Aliquot no. appearances of color Cumulative times (s) consumed 2.0x10 4.0x10 6.0x10 4 8.0x10 4 10.0x10 12.0x10 14.0x10 4 solution 2. Initial [s,o,2 0.10 M; initial (I J 0.05 M. Time experiment starte Time (s) between Total moles of S OR Aliquot no appearances of color Cumulative times (s) consumedExplanation / Answer
Q.2: Since order of iodine clock reaction w.r.to I- is approximately 1, on doubling the cncentration I-, the rate also doubles.
Q.3: To calculate the order of S2O8-2, volume of the aliquot is required.
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