What is the purpose of iodide added to the water sample in the dissolved oxygen

Question

What is the purpose of iodide added to the water sample in the dissolved oxygen test? Select one: a. lodide is oxidized to iodine by manganese(II) b. lodide is oxidized to iodine by dissolved oxygen. O C. lodide reacts with manganese(I) to form an insoluble precipitate. O d. lodide reacts with dissolved oxygen to form the Ol ion. e. lodide is oxidized to iodine by hydroxide ion. In the final stage before adding thiosulfate, the water sample being tested for dissolved oxygen contains triiodide ion (I3 ). A reaction between thiosulfate and triiodide causes a color change at the instant all of the triiodide is consumed. l(aq) + 2 S2032-(aq) 3 I-(aq) +5,062-(aq) Identify the oxidizing and reducing agents in this redox reaction. The oxidizing agent is Choose... The reducing agent is: Choose...

Explanation / Answer

Q1

this is used in order to find up the oxyen in solution...

Iodide will form brown precipitate (I2) which willform the iodide ion (I) to iodine

Iodide ion is then titrated and then we can relate sotichioemtrically

a) false, it is reversed

b) false, it is not oxygen

c) true, I- forms I2

d) false, I wont react wiht oxygen

e) false,

Q2.

I goes from -1/3 to -1 , it is being reduced

S2O3 is being oxdized

therefore:

oxidizing agnet ( is reduced) = must be I3- , since it is reduced, i..e it oxidizes S2O3

reducing agnet (is oxidized) = S2O3-, since it is being oxidized, reduces I3-

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