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Chemistry - reaction mechanism

Hey, I am doing the iodine clock method with the reaction between peroxodisulphate ions and iodide ions?

I need help with drawing out the reaction mechanism. I know that the iodide is oxidised by peroxodisulphate and I believe it goes in 3 steps:

1. S2O8 2- + 2I - --> IS2O8 3-

2. IS2O8 3- --> I+ + 2SO4 2-

3. I+ + I- --> I2

Thank you so much to anyone who helps!
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