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Scoring Scheme: 3-3-2-1 Part III.The two reactions involved in quantitatively determining the amount of iodate in...

Scoring Scheme: 3-3-2-1
Part III.The two reactions involved in quantitatively determining the amount of iodate in solution are:

IO3-(aq) + 5 I-(aq) + 6 H+(aq) --> 3 I2(aq) + 3 H2O(l)

followed by reaction of the I2: I2(aq) + 2 S2O32- --> 2 I-(aq) + S4O62-(aq).

What is the stoichiometric factor, that is the number of moles of Na2S2O3 reacting with one mole of KIO3?

Factor =                    

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Answer #1

Factor=

Since in the balanced equation, 3 moles of I2 produced by one mole of KIO3(IO3-) consumed in the first equation .

In the second equation 1 mole of Iodine is consumed by 2 moles of S2O32-.

Hence for 1 mole of KIO3 Consumes, 3x2 moles of Na2S2O3.

So factor= 6

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