Question

Ozone (O3) is known as a strong oxidising agent that can kill microbial pathogens. In an acidic solution, ozone can oxidise the iodide ion to the iodate ion (IO3−), forming oxygen gas in the process. Deduce the number of electrons transferred in this process.

Answer 1

Answer:

Ozone (O3) is known as a strong oxidising agent that can kill microbial pathogens. In an acidic solution, ozone can oxidise the iodide ion to the iodate ion (IO3−), forming oxygen gas in the process. Deduce the number of electrons transferred in this process.

Answer 2

The oxidation of iodide ion to iodate ion by ozone in acidic solution involves the transfer of 12 electrons. This process can be used to disinfect water and wastewater and is an effective method for controlling microbial pathogens.

Here's how we can determine the number of electrons transferred in this process:

• The oxidation of iodide ion (I^-) to iodate ion (IO3^-) by ozone (O3) in acidic solution involves the transfer of electrons from iodide to ozone.
• The balanced chemical equation for the reaction is:

O3 + 2H+ + 2I^- → O2 + I2 + H2O

• To determine the number of electrons transferred, we need to identify the oxidation states of the elements involved in the reaction.
• Oxygen in O3 has an oxidation state of 0 since it is in its elemental form.
• Iodine in I^- has an oxidation state of -1.
• Iodine in IO3^- has an oxidation state of +5.
• Hydrogen in H+ has an oxidation state of +1.
• Using the oxidation states, we can calculate the change in oxidation state for iodine, which is:

(+5) - (-1) = +6

• This means that each iodine atom loses 6 electrons during the reaction.
• Since two iodine atoms are involved in the reaction, the total number of electrons transferred is:

2 × 6 = 12 electrons.

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