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In the presence of a little starch, this solution turns from colorless to blue when I3– is formed.

The following data were obtained:

[H2SO3] [H+] [I–] Initial Rate (mol/L s)
1.0 x 10-2 2.0 x 10-1 2.0 x 10-1 1.66 x 10-7
3.0 x 10-2 2.0 x 10-1 2.0 x 10-1 4.98 x 10-7
1.0 x 10-2 1.0 x 10-1 2.0 x 10-1 8.30 x 10-8
1.0 x 10-2 2.0 x 10-1 4.0 x 10-1 13.2 x 10-7

Calculate the rate law for this reaction:

rate = k [H
2SO
3]
[H+] [I–]

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