8&9? Complete and balance the following redox equations Is the thiosulfate ion.
ID: 1063165 • Letter: 8
Question
8&9? Complete and balance the following redox equations Is the thiosulfate ion. CIO^- an oxidizing or reducing agent? How many electrons are transferred in reaction (8a)? In the standard dilation process. when the iodate-iodide solution is acidified with H_2SO_4. it should be titrated immediately. Why.? What is the color of the iodate-iodide solution being titrated with Na_2S_2O_3 Before the starch solution is added? After the starch solution is added? At the end point? If 18.92 mL of Na_2S_2O_3 solution was required to titrated the iodine form from 20.95 mL of a 0.0111 M KIO_3 solution and excess Kl, what is the molarity of the N_a_2S_2O_3 solution? A sample of bleach weighing 2.085 g was treated with excess of Kl T iodine liberated required 30.21 mL of the N_a_2S_20_3 solution standard the previous question. Calculate the percent NaOCl in the bleach.)Explanation / Answer
Q8
I-(aq) +o3 (g) + H+(aq) ->
5 (I-I)- + I O3- + 6 H+ 3 I20 + 3 H2O
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IO3- + 5 (I-I)- + 3 H2O 3 I20 + 6 OH-
-
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Is thiosulfafte ion , clo- an oxidising or reducing agent ?
Sodium thiosulfate, Na2S2O3, is a reducing agent.
Sodium thiosulfate reduces tri-iodide to iodide.
S2O3 2- (thiosulfate ion) is reducing the iodine (I2) in order to form the polythionate (tetrathionate) ion S4O6.
ClO-, are oxidizing agents.
ClO- + H2O ---> HClO + OH-
Hypochlorous acid (HClO) is a strong oxidizing agent that gives the "bleaching" action of sodium hypochlorite.
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Q10
How many ions transferred in reaction 8 a
Answer =5
+5 . . . . .-1 . . . . . . ... . 0
IO3- .+ . I- + . H+ . = .I2 . + . H20
| . . . . . . |___(-1e-)__|
|_____(+5e-)______|
now we balance the electrons
+5 . . . . .-1 . . . . . . ... . 0
IO3- .+ .5I- + . H+ . = .I2 . + . H20
| . . . . . . |__5(-1e-)__|
|_____(+5e-)______|
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