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Students should always be careful of the chemical reaction between jewelry and laboratory reagents. The table below show...

Students should always be careful of the chemical reaction between jewelry and laboratory reagents. The table below shows the reduction reactions and potentials for some common lab reagents and metals.

I NEED HELP WITH B)

Ox + ne1- Red Eo(V)
Ni2+(aq) + 2e1- ↔ Ni(s) -0.23
SO42-(aq) + 4H1+(aq) + 2e1- ↔H2SO3(aq) + H2O +0.20
Cu2+(aq) + 2e1- ↔ Cu(s) +0.34
Ag1+(aq) + e1- ↔ Ag(s) +0.80
Pt2+(aq) + 2e1- ↔ Pt(s) +1.19
Cr2O72-(aq) + 14H1+(aq) + 6e1- ↔ 2Cr3+(aq) + 7H2O +1.33
Au3+(aq) + 3e1- ↔ Au(s) +1.50
MnO41-(aq) + 8H1+(aq) + 5e1- ↔ Mn2+(aq) + 4H2O +1.51

(a) What is the net redox reaction that occurs when Au comes into contact with acidic KMnO4? (Use the lowest possible coefficients. Omit states-of-matter from your answer.)

3MnO4- + 24H+ + 5Au  →  5Au3+ + 3Mn2+ + 12H2O (Correct)


(b) What is E°cell for the reaction?

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Answer #1

Oxidation eaction Au (99) 3+ FU (5) + 3ee Rod eattion Mnou (aq 5 Ht (aq) Mn2+ MUtiplying a9) 4H2O by eq eqh-1 y 5 (5AU 5R+ 3

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