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S-20
b) The following is a proposed reaction mechanism for the above reaction:
S2O
8
2-
(aq)
+ I
-
(aq)
2 SO
4
2-
(aq)
+ I
+
(aq)
(6)
I
+
(aq)
+ I
-
(aq)
I
2(aq)
(7)
Using your basic understanding of chemistry, predict which of the above two reactions
could be the rate determining step. Give two reasons to support your choice. (1.0 mark)
c)
The reaction:
2 I
-
(aq)
+ S2O
8
2-
(aq)
2 SO
4
2-
(aq)
+ I
2(aq)
is a redox reaction. Determine the
overall potential for this reaction. Give two reasons explaining why this reaction is/is not
spontaneous. (0.7 marks)
ASSESSMENT
Performance
(1.0 mark):
Value of the Rate Constant (accuracy)
(1.0 mark):
Laboratory Report
(8.0 marks):
Deductions
(if any):
