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Asked by Chitra

Iodate (IO-3) serves as oxidising agent in 1M Hcl sol. while in 9 M it is a reducing agent- give explanation?

The concentration difference is key here. 9 M acid is much, much stronger than 1 M. In 1 M HCl Iodate is more likely to interact with water than with HCl - water molecules have fewer electrons than Iodate - it makes sense that Iodate loses electrons in 1 M acid (remember oxidation is loss). In 9 M HCl Iodate is more likely to interact with chloride ions which would force electron density on to the iodate molecule, thereby reducing it. However - it is still somewhat up for debate what the real reasoning is. Science is the process of using the evidence to judge what is going on, and this is an on-going process. Read more here:

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Angeli Todd

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