did not figure out part 2 or 3 PART 1: IDENTIFICATION oF oxIDATION STATES An Ide

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did not figure out part 2 or 3

PART 1: IDENTIFICATION oF oxIDATION STATES An Identification of Iron and Iron (ll) 1. Identification of iron (Ill) ion, Fea the same the color of iron (l) iron (llp solutions (these are both acidic sol ons). Are they color? Look at chloride and nitrate Likewise, sodium nitrate solution is Fer+ has sodium chloride solution: notice that it is colorless, color alone is difterent colors in solutions; it can be colorless, Therefore, not ferent s indicator such the thiocyanate reliable for identification of Fe3 nstead it can be identified by an a ion in ammonium thiocyanate or potassium thiocyanate solutions. ator. What color is the chloride to a test tube, and add a couple of drops of KscN(aq) Notice it is not a precipitate It is the complex ion FescN2 that forms by the reaction product? Fesa SCN. FesCNP To the same test tube, add sodium hydroxide until the color chang (the complex disappears). The iron (lll) hydroxide precipitate that forms was also 5. What color is the precipitate? To the same test tube, now add sulfuric acid until the color changes. The scN complex returns in acid solution It should be evident that the indicator will not complex with iron (lll) n basic solution. Under basic conditions, the will not show the blood red color of FescN2" until it is iron is in the form of Fe(OH (s A basic solution of iron acidified (before or after adding the thiocyanate indicator solution), 2. dentification of iron (l) ion, Fe To 1 mL of iron (II) sulfate (which was prepared with acid), add a couple of drops of KSCN(aq) indicator s there a significant color change? What color is the solution? lieht o any

Explanation / Answer

Part 2 :

i. Basic condition

Balanced equation,

2MnO4-(aq) + 3H2O2(aq) --> 2MnO2(s) + 3O2(g) + 2OH-(aq) + 2H2O(l)

ii. In acidic condition

2MnO4-(aq) + 5H2O2(aq) + 6H+(aq) --> 2Mn2+(aq) + 5O2(g) + 8H2O(l)

iii. In neutral condition

2MnO4-(aq) + 3H2O2(aq) --> 2MnO2(s) + 3O2(g) + 2H2O(l)

Part III Summary table

H2O2 ---> O2 : bubbles

MnO4-in base --> MnO2(s) : Decolorization

MnO4- in acid --> Mn2+(aq) : Colorless

MnO4- in neutral ---> MnO2 : Decolorization

Fe3+ in acid ---> Fe3+ : no change

Fe3+ in base : Fe2+ : light green

Cr2O7^2- in acid ---> Cr3+ : green

CrO4^2- in base --> Cr2O7^2- : orange

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