We are doing an experiment with Ascorbic Acid (Vitamin C) C6H6O6, i\'m assuming

Question

We are doing an experiment with Ascorbic Acid (Vitamin C) C6H6O6, i'm assuming these are all combustion reactions or?

Ascorbic Acid Dehydroascorbic Acid A: Reaction of iodate with iodide to form the triiodide ion: IO3I -13 chemPad Help Greek 2103-+ IO 34-IA- -> B: Oxidation of ascorbic acid (C6H806) to dehydroascorbic acid (C6H606) by the triiodide ion: 13" + C6H8O6-->+ C6H606 chemPad Help Greek C: Reduction of the excess triiodide with thiosulfate: 13. + S2032-->+ S4062. I3 +S203-IS406

Explanation / Answer

All these reactions are redox reactions because in redox reaction, oxidation and reduction takes place simultaneously.

Oxidation means loss of electrons and reduction menas gain of electrons.

So, in redox reaction, one species loses electrons and other species gains those electrons.

In first reaction, IO3^- + I^- ---> I3 ^-

Here, oxidation state of I in IO3^- is +5(x- 6= -1 ). Similarly, oxidation state of I in in I^- is -1.and that in I3- is -1/3(3x= -1).

Here, I in IO3^- is reduced to I3^-. Also, I from I- is oxidised to I3^-.As, oxidation and reduction occurs simultaneously, so it is redox reaction.

Similarly, reaction B and C are also redox reactions.

In reaction B ,

I3^- is reduced to I- and C6H8O6 is oxidised to C6H6O6.

In reaction C, I3- is reduced to I- and S2O3^2- is oxidised to S4O6^2-.

So, all these are redox reactions.

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