1-10 Name Post-Lab Questions I How can potassium thiocyanate be used to confirm

Question

1-10 Name Post-Lab Questions I How can potassium thiocyanate be used to confirm that Fel ioms have bee odized to Fo 2 Use the oxidation state rules to assign oxidation states for the indicated atoms in each oxidizing agent and ts prodocs Pa Arom Mn Oxidizing Agent MnO, Oxidation State Product Mas- Oxidation Siate ocI CT 3. Determine the number of electrons (n) involved in each half-reaction ne. MnO..(aq) 8H"(aq) + Mn'"(aq) + 4H20) a, + , H,or(aq) + 2H.(aq) + ne. 2Hf)(1) e, OCI (aq) + H2O(l) + ne. craq) + 20H0aq) 4. Combine the oxidation half-reaction for Fels (see the Background section) with the appropriate halt-resetion from Question #3 and write the balanced equation for the overall redox reaction of Fe gen peroxide, and (c) hypochlorite ion. with (a) permanganate nn,(5)hyd 5. Cirele the correct choices: An oxidizing agent is a substance that causes the (oxidationireduction) of another seactane redox reaction. The oxidation state of the oxidizing agent (increasesidecreases) and the oxidizing agent itself andergses (oxidation/reduction) during the reaction.

Explanation / Answer

1)The colorless KSCN solution and nearly colorless Fe(NO3 )3solution should form a brownish-red product.

2)

-1

3) a) 5

b) 2

c) 2

4) a) MnO4- + 8H+ + 5Fe2+ = Mn2+ + 4H2O + 5Fe3+

b) H2O2 + 2H+ + 2Fe2+ = 2Fe3+ + 2H2O

c) OCl- + H2O + 2Fe2+ = 2Fe3+ + Cl- + 2OH-

5) oxidation, decreases, reduction

oxidation state oxidation state 7 2 -1 -2 1

-1

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