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The formation of the iodine can easily be detected because all other species in the reaction mixture are colourless. The addition of starch to the reaction mixture further enhances the colour change by forming a dark blue-black complex with the iodine. The overall ionic equation is: (the spectator ions K+ have been left out to see the electron transfer clearly)
S2O82- (aq) + 2I- (aq) ? 2SO42- (aq) + I2 (aq)
The initial rate of the reaction can be measured by measuring the time it takes to produce a fixed small amount of iodine in the reaction as mentioned above. This can be done by adding thiosulphate ions into the reaction system which instantaneously revert the iodine molecules to iodide ions...
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Common topics in this essay:
- Chemistry - Rates of Reaction investigation
- Reaction
- Reaction
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- Reaction Kinetics
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